Situated on a plateau and surrounded by mountains, Mexico City – seen here in a haze on May 20, 2018 – is a ‘bowl’ that traps smog and dust.
AP Photo/Marco Ugarte
The Aztecs had a shining city on a lake, with canals, causeways and aqueducts – until the Spanish came. Mexico City is still suffering the consequences of their bad public health decisions.
Much of India experiences both extreme heat and extreme air pollution, as seen in this photo of the Akshardham Hindu temple. Days with both are going to increase.
Sajjad Hussain/AFP via Getty Images
In South Asia, days with both extreme heat and extreme pollution are expected to increase 175% by 2050. Separately, the health effects are bad; together they will likely be worse.
Bike routes have been expanded in many major cities, including Bogata, Columbia, to encourage people to avoid crowded public transportation.
(AP Photo/Fernando Vergara)
Bike shops have seen record sales during the pandemic as people try to avoid crowded transportation. But governments must do more to keep new cyclists in the saddle.
Strict physical distancing restrictions have resulted in cleaner air, but atmospheric carbon dioxide levels continue to rise.
Despite clear air as a result of the pandemic reducing human activities, our emissions still soar.
Flamingos crowd a muddy area in Mumbai, India, May 17 2020.
Citizen scientists have helped researchers track the changing environment during the pandemic.
A man pulls a cart through the early morning smog in Nairobi.
TOBIN JONES/AFP via Getty Images
We found that air pollution levels in Nairobi increased by 182% over the study period, Kampala by 162% and Addis Ababa by 62%.
Surfers walk on the beach while the fire continues to blaze on the mountains behind them in 2015 in Cape Town, South Africa.
Shelley Christians/The Times/Gallo Images/Getty Images
Until now, the interaction of temperature and air pollution and its contribution to these diseases hasn't been studied conclusively in South Africa - or anywhere on the African continent.
Artisanal small-scale gold mining polluted this stream and deforested sections of the Madre de Dios area of Peru.
Mario Tama/Getty Images
Small-scale gold mining operations in developing countries are major sources of toxic mercury pollution, using techniques that haven't changed much since the California Gold Rush 150 years ago.
Smog enshrouding the Yellow Crane Tower in Wuhan city, China, in 2013.
EPA/HOW HWEE YOUNG
The new data shows this drop in air pollution may have prevented up to 10,822 deaths in China as a whole.
CHRISTOPHE PETIT TESSON / EPA
Yes, poor air quality is bad for your health – but beware simplistic correlations with COVID-19.
A cyclist rides in The Mall, London, May 10 2020.
As lockdowns ease off, there is a danger that the old city traffic jams will soon be back with a vengeance.
Clear skies over Los Angeles, April 17, 2020.
Araya Diaz/Getty Images
From Nairobi to Los Angeles, pandemic lockdowns have cleared pollution from the skies. But those blue vistas may be temporary, and shutdowns aren't slowing climate change.
Diesel emissions are a major source of fine particle pollution.
Bob Chamberlin/Getty Images
After a 5-year review, the EPA is leaving US standards for fine particle air pollution unchanged, even though recent studies suggest that tightening them could save thousands of lives yearly.
FABRIZIO BENSCH/ Reuters
Researchers built cheap air quality monitors using parts found at hardware and electronics scores. The results have big implications for anyone who travels outside near busy roads.
Scientists have wondered what role — if any — air pollution has in the COVID-19 pandemic.
(AP Photo/Gemunu Amarasinghe)
The link between air pollution and elevated death rates for COVID-19 may be overestimated.
Madrid’s skyline on a clear night.
As lockdowns have came into effect around the world, air pollution has plummeted.
A mask rated N95 or N99 will best protect against pollution particles.
Commercially available respirator masks are becoming a popular choice for cyclists and pedestrians wanting to reduce pollution exposure.
Reducing fine particle air pollution from petrochemical complexes, like this one near the Houston Ship Channel in Texas, is a low-cost way to lower air pollution mortality.
AP Photo/David J. Phillip
A new study takes an innovative approach to reducing fine particle air pollution and spotlights key sources: factories that burn coal and oil, petrochemical plants and burning wood for home heating.
Secondhand smoke may come from many miles away.
According to a new study, about four in 10 air pollution deaths in the US are due to emissions crossing state lines.
Breathing bushfire smoke can be particularly dangerous for people with pre-existing conditions.
Millions of Australians far from the bushfires' direct path have been affected by smoke haze. Here's everything we know about the effects of bushfire smoke on our health.