New submitter Baloo Uriza writes: In a rare display of sanity in the automotive space, British Columbia has banned autonomous cars from its highways after years of watching autonomous cars hamper emergency response efforts in California and outright kill a pedestrian in Arizona. Let's hope this regulatory trend continues and moves into the human space by pulling licenses of drivers with a known history of poor driving. In the shared article, The Drive notes that the ban only applies to self-driving vehicles that exceed a Society of Automotive Engineers (SAE) autonomy rating of Level 2. [A full breakdown of each of the levels can be found here.] The ban is part of an update to B.C.'s Motor Vehicle Act that went into effect on April 5, 2024 and includes possible consequences of a max penalty of $2,000 (CAD) in fines and up to six months of prison time. Importantly, the ban could change as autonomous driving tech evolves in the coming years.

Since the ban doesn't affect Level 2 vehicles, Tesla owners who use Autopilot and FSD, as well as Ford and GM vehicle owners with BlueCruise and Super Cruise, will be exempt. In fact, there are currently no Level 3 autonomous vehicles for sale in Canada.

Researchers in Canada got most of what they were hoping for in the country's 2024 federal budget, with a big boost in postgraduate pay and more funding for research and scientific infrastructure. From a report: "We are investing over $5 billion in Canadian brainpower," said finance minister Chrystia Freeland in her budget speech on 16 April. "More funding for research and scholarships will help Canada attract the next generation of game-changing thinkers."

Postgraduate students and postdoctoral researchers have been advocating for higher pay for the past two years through a campaign called Support Our Science. They requested an increase in the value, and number, of federal government scholarships, and got more than they asked for. Stipends for master's students will rise from Can$17,500 (US$12,700) to $27,000 per year, PhDs stipends that ranged from $20,000 to $35,000 will be set to a uniform annual $40,000 and most postdoctoral-fellowship salaries will increase from $45,000 to $70,000 per annum. The number of scholarships and fellowships provided will also rise over time, building to around 1,720 more per year after five years.

"We're very thrilled with this significant new investment, the largest investment in graduate students and postdocs in over 21 years," says Kaitlin Kharas, a PhD student at the University of Toronto, Canada, and executive director of Support Our Science. "It will directly support the next generation of researchers." Although only a small proportion of students and postdoctoral fellows receive these federal scholarships, other funders tend to use them as a guide for their own stipends. Many postgraduates said that low pay was forcing them to consider leaving Canada to pursue their scientific career, says Kharas, so this funding should help to retain talent in the country.

TikTok has started testing its Instagram competitor, TikTok Notes, in Canada and Australia. TechCrunch reports: The company said on X that it is in the "early stage" of the app's rollout and that the app is "a dedicated space for photo and text content." "We hope that the TikTok community will use TikTok Notes to continue sharing their moments through photo posts. Whether documenting adventures, expressing creativity, or simply sharing snapshots of one's day, the TikTok Notes experience is designed for those who would like to share and engage through photo content," it said.

The company didn't say much about the app's features and functionality apart from the fact that users can log in with their existing TikTok account. Even the app's description in the app stores is pretty light on details. The screenshots on the App Store listing suggest that the posts will appear in two-column grids on the home page. The screenshots also indicate that you can post multiple photos through a carousel post.

Movie exhibitors still face "serious risks," the Los Angeles Times reported Tuesday: Attendance was on the decline even before the pandemic shuttered theaters, thanks to changing consumer habits and competition for people's time and money from other entertainment options. The industry has demonstrated an over-reliance on Imax-friendly studio action tent poles, when theater chains need a deep and diverse roster of movies in order to thrive... It remains to be seen whether the global box office will ever get back to the $40 billion-plus days of 2019 and earlier years. A clearer picture will emerge in 2025 when the writers' and actors' strikes are further in the past. But overall, there's a strong case that moviegoing has proved to be relatively sturdy despite persistent difficulties.
Which brings us to this year's CinemaCon convention, where multiplex operators heard from Hollywood studios teasing upcoming blockbusters like Joker: Folie à Deux, Furiosa: A Mad Max Saga, Transformers One, and Deadpool & Wolverine. Exhibitors pleaded with the major studios to release more films of varying budgets on the big screen, while studios made the case that their upcoming slates are robust enough to keep them in business... Box office revenue in the U.S. and Canada is expected to total about $8.5 billion, which is down from $9 billion in 2023 and a far cry from the pre-pandemic yearly tallies that nearly reached $12 billion... Though a fuller release schedule is expected for 2025, talk of budget cuts, greater industry consolidation and corporate mergers has forced exhibitors to prepare for the possibility of a near future with fewer studios making fewer movies....

As the domestic film business has been thrown into turmoil in recent years, Japanese cinema and faith-based content have been two of movie theaters' saving graces. Industry leaders kicked off CinemaCon on Tuesday by singing the praises of Sony-owned anime distributor Crunchyroll's hits — including the latest "Demon Slayer" installment. Mitchel Berger, senior vice president of global commerce at Crunchyroll, said Tuesday that the global anime business generated $14 billion a decade ago and is projected to generate $37 billion next year. "Anime is red hot right now," Berger said. "Fans have known about it for years, but now everyone else is catching up and recognizing that it's a cultural, economic force to be reckoned with.... " Another type of product buoying the exhibition industry right now is faith-based programming, shepherded in large part by "Sound of Freedom" distributor Angel Studios...

Theater owners urged studio executives at CinemaCon to put more films in theaters — and not just big-budget tent poles timed for summer movie season and holiday weekends... "Whenever we have a [blockbuster] film — whether it be 'Barbie' or 'Super Mario' ... records are set," added Bill Barstow, co-founder of ACX Cinemas in Nebraska. "But we just don't have enough of them."

This week the new "Find My Device" feature rolled out to Android devices around the world, starting in the U.S. and Canada.

"With a new, crowdsourced network of over a billion Android devices, Find My Device can help you find your misplaced Android devices and everyday items quickly and securely," according to a Google blog post. ZDNet explains: Although Google already offers a Find My Device setting on Android phones, the device you're looking for must be powered on and connected for the feature to work. The new Find My Device network is designed to use Bluetooth to track down missing phones and other devices that are disconnected from a Wi-Fi or cellular network. A Powered Off Finding feature would let each device store beacons in its Bluetooth controller's memory, letting the network see any supported device even if it's not connected.
From Google's blog post: Locate your compatible Android phone and tablet by ringing them or viewing their location on a map in the app — even when they're offline. And thanks to specialized Pixel hardware, Pixel 8 and 8 Pro owners will also be able to find their devices if they're powered off or the battery is dead.

Starting in May, you'll be able to locate everyday items like your keys, wallet or luggage with Bluetooth tracker tags from Chipolo and Pebblebee in the Find My Device app.
Google promises "end-to-end encryption of location data as well as aggregated device location reporting, a first-of-its-kind safety feature that provides additional protection against unwanted tracking back to a home or private location." Find My Device is available on compatible devices running Android 9 or higher.

In addition, "Sometimes what we're looking for is right under our noses. If you're close to your lost device but need a little extra help tracking it down, a 'Find nearby' button will appear to help you figure out exactly where it's hiding. You'll also be able to use this to find everyday items, like your wallet or keys, when Bluetooth tags launch in May.

"More often than not, we lose everyday items like our keys or phone right at home. So the Find My Device app now shows a lost device's proximity to your home Nest devices, giving you an easy reference point."

sinij shares a report: Members of Parliament in Canada are expected to vote for up to 15 hours in a row Thursday and Friday on more than 200 Conservative amendments to the government's sustainable jobs bill. The amendments are what's left of nearly 20,000 changes the Conservatives proposed to Bill C-50 last fall at a House of Commons committee. Liberals now contend the Conservatives came up with the amendments using artificial intelligence in order to gum up the government's agenda. The Conservatives deny that accusation.

President Joe Biden said he is "considering" a request from Australia to drop the prosecution of WikiLeaks founder Julian Assange. The BBC reports: The country's parliament recently passed a measure -- backed by PM Anthony Albanese -- calling for the return of Mr Assange to his native Australia. The US wants to extradite the 52-year-old from the UK on criminal charges over the leaking of military records. Mr Assange denies the charges, saying the leaks were an act of journalism. The president was asked about Australia's request on Wednesday and said: "We're considering it."

Mr Assange, 52, is fighting extradition in the UK courts. The extradition was put on hold in March after London's High Court said the United States must provide assurances he would not face the death penalty. The High Court is due to evaluate any responses from the US authorities at the end of May. The measure passed the Australian parliament in February. Mr Albanese told MPs: "People will have a range of views about Mr Assange's conduct... But regardless of where people stand, this thing cannot just go on and on and on indefinitely."

As the moon blocked the view of the sun across parts of Mexico, the United States and Canada on Monday, the celestial event managed another magnificent feat: It got people offline. From a report: According to Cloudflare, a cloud-computing service used by about 20 percent of websites globally, internet traffic dipped along the path of totality as spellbound viewers took a break from their phones and computers to catch a glimpse of the real-life spectacle.

The places with the most dramatic views saw the biggest dips in traffic compared with the previous week. In Vermont, Arkansas, Indiana, Maine, New Hampshire and Ohio -- states that were in the path of totality, meaning the moon completely blocked out the sun -- internet traffic dropped by 40 percent to 60 percent around the time of the eclipse, Cloudflare said. States that had partial views also saw drops in internet activity, but to a much lesser extent. At 3:25 p.m. Eastern time, internet traffic in New York dropped by 29 percent compared with the previous week, Cloudflare found.

The path of totality made up a roughly 110-mile-wide belt that stretched from Mazatlan, Mexico, to Montreal. In the Mexican state of Durango, which was in the eclipse zone, internet traffic measured by Cloudflare dipped 57 percent compared with the previous week, while farther south, in Mexico City, traffic was down 22 percent. The duration of the eclipse's totality varied by location, with some places experiencing it for more than four minutes while for others, it was just one to two minutes.

Despite investing billions in new streaming services, media giants have failed to dethrone old favorites, according to Nielsen data. The 21-year-old legal drama "NCIS" tops the list, with viewers streaming 11.4 million episodes per week. Netflix dominates the top 10, with eight shows owing most of their viewership to the platform. Reruns from CBS and other networks make up the majority of the list, with "Stranger Things" being the only original series.

"Nine of the 10 most-watched streaming programs are reruns. In addition to the three from CBS, there is one from YouTube (CoComelon), one from Canada (Heartland), one from Australia (Bluey) and Suits. The only original series to crack the list is Stranger Things," Bloomberg writes. However: "While reruns dominate the top 10, that is not the case overall. Most of the 100 most popular titles of the last three years are original series," it added.

An anonymous reader quotes a report from the Daily Hive: It is now the third consecutive day a major housing funding announcement has been made by Prime Minister Justin Trudeau. Friday's announcement entails over $600 million in investments targeted to help lower the construction cost of homes and speed up building timelines, with a new focus on creating new building innovation technologies. This includes a new $50 million Homebuilding Technology and Innovation Fund, which the federal government aims to leverage an additional $150 million from the private sector and other levels of government. Another $50 million will be invested in ideas and technology such as prefabricated housing factories, mass timber production, panelization, 3D printing, and pre-approved home design catalogues -- specifically projects already funded.

As well, $11.6 million will go towards the federal government's previously announced Housing Design Catalogue to create a standardized home structure design for simplicity as well as construction and cost efficiencies. The vast majority of today's announced funding will go into the federal Apartment Construction Loan Program, which provides low-cost financing to support new rental housing projects using innovative construction techniques from prefabricated and modular housing manufacturers as well as other homebuilders. Prime Minister Justin Trudeau said in a statement: "We're changing the way we build homes in Canada. In Budget 2024, we're supporting a new approach to construction, with a focus on innovation and technology. This will make it easier and more cost-effective to build more homes, faster. You should be able to live in the community you love, at a price you can afford."

vik writes: According to this BBC article Tennessee just passed a bill banning the dispersion of chemicals in the air that affect weather and temperature. Sponsored by the chemtrail and anti-geoengineering crowds, if signed into law it seems it would ban atmospheric CO2 emissions:

The bill forbids "intentional injection, release, or dispersion" of chemicals into the air. It doesn't explicitly mention chemtrails, which conspiracy theorists believe are poisons spread by planes. Instead it broadly prohibits "affecting temperature, weather, or the intensity of the sunlight". The Republican-sponsored bill passed along party lines on Monday. If it is signed by Tennessee's governor, Republican Bill Lee, it will go into effect on 1 July.

President Joe Biden has become the first sitting U.S. president to post on a decentralized networking protocol. As reported by The Verge, President Biden's Threads account "has begun using Meta's ActivityPub integration," which allows for content, data, and followers to be ported between networks -- the basis that makes up the "fediverse." From the report: The account turning on fediverse posting comes only a couple of weeks after Threads rolled out its beta ActivityPub integration for users in the US, Canada, and Japan. Biden may not be able to see replies and follows as they pour in from the fediverse -- and with some servers blocking connections to Meta, not everyone there will be able to see his posts -- as those features weren't part of Threads' integration when it opened up beta testing last month. But his posts are available, and he'll see likes coming in from there. Or whoever is running the Presidential Threads account will, anyway.

Thawing ice in the Arctic may open up new routes for internet cables that lie at the bottom of the ocean and carry most international data traffic. And more routes matter when underwater infrastructure is at risk of attack. From a report: Baltic Sea gas and telecoms cables were damaged last year, with a Chinese vessel a potential suspect. Red Sea data cables were cut last month after a Yemeni government warning of attacks by Iran-backed Houthi rebels. Over 90 percent of all Europe-Asia traffic flows through the Red Sea route. The problem of critical data relying on only one path is clear. "It's clearly a kind of concentration of several cables, which means that there is a risk that areas will bottleneck," Taneli Vuorinen, the executive vice president at Cinia, a Finland-based company working on an innovative pan-Arctic cable, said.

"In order to meet the increasing demand, there's an increasing pressure to find diversity" of routes, he said. The Far North Fiber project is seeking to offer just that. The 14,500 kilometer long cable will directly link Europe to Japan, via the Northwest Passage in the Arctic, with landing sites in Japan, the United States (Alaska), Canada, Norway, Finland and Ireland. It would have been unthinkable until just a few years ago, when a thick, multiyear layer of ice made navigation impossible. But the Arctic is warming up at a worrying pace with climate change, nearly four times faster than the rest of the world. Sea ice is shrinking by almost 13 percent every decade.

In 2019 Los Angeles film/TV producer Brian Morrison painted Blockbuster's logo onto an old newspaper box — and then filled it up with used DVDs. "The Free Blockbuster movement slowly gained traction," reports the New York Times — aided at times by social media — "and eventually more than 200 other community boxes had opened from Louisiana to Canada and even Britain."

Though it's not clear how many are still operational, a 37-year-old California opened a free "Blockbuster" library outside her home earlier this year, according to the article, "and stocks it with season-specific films, subversive books and free candy." "We are social animals; we want to go out into the world and engage with each other," said Brian Morrison, who keeps a lending library outside his home. He often refills it with DVDs and VHS tapes of TV series, horror movies and, on occasion, signed independent films, and said that it had encouraged interaction with his neighbors.

Andrew Kevin Walker, a Los Angeles-based screenwriter, said he had visited secondhand stores especially to seek out films to leave in the boxes, including two sealed James Bond box sets and a copy of "Cobra," a 1986 film written by Sylvester Stallone. "It's an opportunity for people to really share their love of cinema, whether it be their favorite guilty pleasure or their favorite movie of all time," he said.

Viewers with streaming fatigue say they are tired of chasing content that moves around an ever-expanding array of platforms or even disappears altogether, and some long for the physical media that was dominant until streaming took over. "I think it's great that folks are doing this, keeping the spirit of DVDs alive, circulating film[s] in and exchanging them," said Joe Pichirallo, a film producer and professor at New York University...

Alfonso Castillo, who co-founded a Free Blockbuster on Long Island, N.Y., with his son, said the lending library sees regular turnover with people both taking and dropping off movies, including older people. "My sense is that for them, it's less of this cool novelty sort of ironic thing and more like, finally, there's a place to get DVDs again," he said.
Award-winning filmmaker Ava DuVernay misses the commentary tracks on DVDs (along with director's cuts).

But more importantly, they told the Times that when it comes to art, "nothing beats holding it in your hand... It is a part of the experience of consuming and experiencing art."

An anonymous reader shared this report from The Register: Chinese spies exploited a couple of critical-severity bugs in F5 and ConnectWise equipment earlier this year to sell access to compromised U.S. defense organizations, UK government agencies, and hundreds of other entities, according to Mandiant.

The Google-owned threat hunters said they assess, "with moderate confidence," that a crew they track as UNC5174 was behind the exploitation of CVE-2023-46747, a 9.8-out-of-10-CVSS-rated remote code execution bug in the F5 BIG-IP Traffic Management User Interface, and CVE-2024-1709, a path traversal flaw in ConnectWise ScreenConnect that scored a perfect 10 out of 10 CVSS severity rating.

UNC5174 uses the online persona Uteus, and has bragged about its links to China's Ministry of State Security (MSS) — boasts that may well be true. The gang focuses on gaining initial access into victim organizations and then reselling access to valuable targets... Just last month, Mandiant noticed the same combination of tools, believed to be unique to this particular Chinese gang, being used to exploit the ConnectWise flaw and compromise "hundreds" or entities, mostly in the U.S. and Canada. Also between October 2023 and February 2024, UNC5174 exploited CVE-2023-22518 in Atlassian Confluence, CVE-2022-0185 in Linux kernels, and CVE-2022-3052, a Zyxel Firewall OS command injection vulnerability, according to Mandiant.

These campaigns included "extensive reconnaissance, web application fuzzing, and aggressive scanning for vulnerabilities on internet-facing systems belonging to prominent universities in the U.S., Oceania, and Hong Kong regions," the threat intel team noted.
More details from The Record. "One of the strangest things the researchers found was that UNC5174 would create backdoors into compromised systems and then patch the vulnerability they used to break in. Mandiant said it believes this was an 'attempt to limit subsequent exploitation of the system by additional unrelated threat actors attempting to access the appliance.'"

The guardians of the world's official geological timescale have firmly rejected a proposal to declare an Anthropocene epoch, after an epic academic row. From a report: The proposal would have designated the period from 1952 as the Anthropocene to reflect the planet-changing impact of humanity. It would have ended the Holocene epoch, the 11,700 years of stable climate since the last ice age and during which human civilisation arose. The International Union of Geological Sciences (IUGS) has announced, however, that geologists have rejected the idea in a series of votes. Those objecting noted a much longer history of human impacts on Earth, including the dawn of agriculture and the industrial revolution, and unease about including a new unit in the geological timescale with a span of less than less than a single human lifetime, it said. Most units span thousands or millions of years.

It also acknowledged: "The Anthropocene as a concept will continue to be widely used not only by Earth and environmental scientists, but also by social scientists, politicians and economists, as well as by the public at large. As such, it will remain an invaluable descriptor in human-environment interactions." The Anthropocene working group (AWG), which was formed by the Subcommission on Quaternary Stratigraphy (SQS), in turn part of the IUGS, took 15 years to develop the proposal. It concluded that the radioactive isotopes spread worldwide by hydrogen bomb tests were the best marker of humanity's transformation of the planet. Geological time units also need a specific location to typify the unit and the Crawford sinkhole lake in Canada was chosen.

In a Threads post today, Meta CEO Mark Zuckerberg announced that the Twitter rival is rolling out a beta of its fediverse integration in the U.S., Canada, and Japan. With the feature enabled, Threads users will be able to cross-post and view likes from other federated platforms, like Mastodon. The Verge reports: Threads previewed its fediverse integration earlier this week during the FediForum. As outlined on its support page, Meta says that you must have a public account to turn on fediverse sharing, which will allow users on other servers to "search for and follow your profile, view your posts, interact with your content, and share your content to anyone on or off their server."

There are still a few limitations, though. The beta currently doesn't let users view replies and follows from the fediverse, for example. Meta also can't promise that when you delete a federated post on Threads, it will also get deleted on the other platforms it was shared on.

theodp writes: "Last year," Ian Bogost writes in Universities Have a Computer-Science Problem, "18 percent of Stanford University seniors graduated with a degree in computer science, more than double the proportion of just a decade earlier. Over the same period at MIT, that rate went up from 23 percent to 42 percent. These increases are common everywhere: The average number of undergraduate CS majors at universities in the U.S. and Canada tripled in the decade after 2005, and it keeps growing. Students' interest in CS is intellectual -- culture moves through computation these days -- but it is also professional. Young people hope to access the wealth, power, and influence of the technology sector. That ambition has created both enormous administrative strain and a competition for prestige."

"Another approach has gained in popularity," Bogost notes. "Universities are consolidating the formal study of CS into a new administrative structure: the college of computing. [...] When they elevate computing to the status of a college, with departments and a budget, they are declaring it a higher-order domain of knowledge and practice, akin to law or engineering. That decision will inform a fundamental question: whether computing ought to be seen as a superfield that lords over all others, or just a servant of other domains, subordinated to their interests and control. This is, by no happenstance, also the basic question about computing in our society writ large."

Bogost concludes: "I used to think computing education might be stuck in a nesting-doll version of the engineer's fallacy, in which CS departments have been asked to train more software engineers without considering whether more software engineers are really what the world needs. Now I worry that they have a bigger problem to address: how to make computer people care about everything else as much as they care about computers.

schwit1 shares a report from ScienceAlert: Sound waves fossilized in the maps of galaxies across the Universe could be interpreted as signs of a Big Bang that took place 13 billion years earlier than current models suggest. Last year, theoretical physicist Rajendra Gupta from the University of Ottawa in Canada published a rather extraordinary proposal that the Universe's currently accepted age is a trick of the light, one that masks its truly ancient state while also ridding us of the need to explain hidden forces. Gupta's latest analysis suggests oscillations from the earliest moments in time preserved in large-scale cosmic structures support his claims. "The study's findings confirm that our previous work about the age of the Universe being 26.7 billion years has allowed us to discover that the Universe does not require dark matter to exist," says Gupta. "In standard cosmology, the accelerated expansion of the Universe is said to be caused by dark energy but is in fact due to the weakening forces of nature as it expands, not due to dark energy." [...]

Current cosmological models make the reasonable assumption that certain forces governing the interactions of particles have remained constant throughout time. Gupta challenges a specific example of this 'coupling constant', asking how it might affect the spread of space over exhaustively long periods of time. It's hard enough for any novel hypothesis to survive the intense scrutiny of the scientific community. But Gupta's suggestion isn't even entirely new -- it's loosely based on an idea that was shown the door nearly a century ago. In the late 1920s, Swiss physicist Fritz Zwicky wondered if the reddened light of far distant objects was a result of lost energy, like a marathon runner exhausted by a long journey across the eons of space. His 'tired light' hypothesis was in competition with the now-accepted theory that light's red-shifted frequency is due to the cumulative expansion of space tugging at light waves like a stretched spring.

The consequences of Gupta's version of the tired light hypothesis -- what is referred to as covarying coupling constants plus tired light, or CCC+TL -- would affect the Universe expansion, doing away with mysterious pushing forces of dark energy and blaming changing interactions between known particles for the increased stretching of space. To replace existing models with CCC+TL, Gupta would need to convince cosmologists his model does a better job of explaining what we see at large. His latest paper attempts to do that by using CCC+TL to explain fluctuations in the spread of visible matter across space caused by sound waves in a newborn Universe, and the glow of ancient dawn known as the cosmic microwave background. While his analysis concludes his hybrid tired light theory can play nicely with certain features of the Universe's residual echoes of light and sound, it does so only if we also ditch the idea that dark matter is also a thing. The research has been published in The Astrophysical Journal.

An anonymous reader quotes a report from The Guardian: Only seven countries are meeting an international air quality standard, with deadly air pollution worsening in places due to a rebound in economic activity and the toxic impact of wildfire smoke, a new report has found. Of 134 countries and regions surveyed in the report, only seven -- Australia, Estonia, Finland, Grenada, Iceland, Mauritius and New Zealand -- are meeting a World Health Organization (WHO) guideline limit for tiny airborne particles expelled by cars, trucks and industrial processes. The vast majority of countries are failing to meet this standard for PM2.5, a type of microscopic speck of soot less than the width of a human hair that when inhaled can cause a myriad of health problems and deaths, risking serious implications for people, according to the report by IQAir, a Swiss air quality organization that draws data from more than 30,000 monitoring stations around the world.

While the world's air is generally much cleaner than it was in much of the past century, there are still places where the pollution levels are particularly dangerous. The most polluted country, Pakistan, has PM2.5 levels more than 14 times higher than the WHO standard, the IQAir report found, with India, Tajikistan and Burkina Faso the next most polluted countries. But even in wealthy and fast-developing countries, progress in cutting air pollution is under threat. Canada, long considered as having some of the cleanest air in the western world, became the worst for PM2.5 last year due to record wildfires that ravaged the country, sending toxic spoke spewing across the country and into the US. In China, meanwhile, improvements in air quality were complicated last year by a rebound in economic activity in the wake of the Covid-19 pandemic, with the report finding a 6.5% increase in PM2.5 levels.

The most polluted urban area in the world last year was Begusarai in India, the sixth annual IQAir report found, with India home to the four most polluted cities in the world. Much of the developing world, particularly countries in Africa, lacks reliable air quality measurements, however. The WHO lowered its guideline for "safe" PM2.5 levels in 2021 to five micrograms per cubic meter and by this measure many countries, such as those in Europe that have cleaned up their air significantly in the past 20 years, fall short. But even this more stringent guideline may not fully capture the risk of insidious air pollution. Research released by US scientists last month found there is no safe level of PM2.5, with even the smallest exposures linked to an increase in hospitalizations for conditions such as heart disease and asthma.