Rajat Gupta / EPA
Winter has once again brought severe air pollution to the Indian capital.
Flames and smoke shroud State Route 33 as a wildfire burns in Ventura, California, Dec. 5, 2017.
Daniel Dreifuss via AP
Intense wildfires in southern California are triggering air quality alerts. Health experts know surprisingly little about how inhaling smoke affects human health, especially over the long term.
Pacific seabirds, such as this Great Blue Heron, can accumulate mercury in their bodies from the fish they eat.
Mercury levels in seabirds living off the coast of British Columbia have been stable in recent years. New research suggests that this may be due to changes in their diet, not pollution control.
Widnes, England, during the late 19th century.
Researchers have found a way to measure the impact of air pollution during 19th-century England on the public's health.
Fracking has led to an increase in truck traffic, one of the reasons for worsening trends on air quality in areas with oil and gas drilling.
AP Photo/Charles Rex Arbogast
The fracking boom has led to a large increase of hydrocarbon emissions in rural areas, reversing some regional air toxics trends.
Airports are caught in a bind, relying on income from parking fees but under pressure to make sure fewer passengers pay them. Vote with your wallet.
Demolishing the coal-fired R.E. Burger Power Station in Shadyside, Ohio, July 29, 2016.
Energy Secretary Rick Perry has proposed to reward coal plants for stockpiling fuel onsite – allegedly making the power system more reliable. Two economists give this idea a failing grade.
Mercury pollution, often released from gold mining and coal power stations, is a global problem.
For the first time research has shown that mercury released in the northern hemisphere ends up in Australia's tropics.
Sensors distributed in 2016 as part of the Ambassad’air project to equip residents of Rennes.
The use of small devices to measure the presence of fine particles in the air is becoming widespread. They're one more weapon to fight against air pollution, but questions remain on their reliability.
Beijing residents with a variety of approaches to urban air pollution.
In recent years the number of motor vehicles – and the pollution they generate – has grown astronomically, leading some citydwellers to wear facemasks in the hopes of protecting themselves. So do they work?
Sao Paulo, Brazil, 2013. Subways abound in fine particles often carried by brakes or trains.
Diego Torres Silvestre/Flickr
Subways seem like the perfect solution to improve air quality in cities. But what about air quality underground?
Coal stockpile at a Milwaukee, Wisconsin power plant, 2011.
A recent study shows that large piles of coal produce measurable quantities of fine particulate air pollution within a 25-mile radius. Covering coal trains and storage piles could reduce the problem.
The estimated economic value of minimising the damage to public health has been reduced by 80 percent.
Coal-fired power stations, metal smelting and vehicle emissions all pump mercury into the atmosphere.
Australia is the 16th-largest emitter of mercury in the world. A huge amount comes from coal power stations – and a new report argues our pollution guidelines are hopelessly lax.
Household air pollution in Nairobi is primarily driven by fuels burnt for cooking and lighting.
Research in Kenya’s capital found average levels of hazardous solid and liquid particles in the air within households were three times more than the WHO recommended maximum level.
A boy plays cricket among smoke in Karachi. Deaths from air pollution across the globe will increase as climate change accelerates.
A new study suggests climate change will cause changes to patterns of ground-level ozone and smog – two deadly pollutants set to increase deaths by about 260,000 worldwide by the end of the century.
Residents of high-density housing might value features such as balconies, but when roads get busy this increases exposure to pollution.
Many new housing developments are being built along busy roads and rail lines, but lack design features that would reduce occupants' exposure to harmful traffic pollution.
The evidence that living near exhaust stacks from busy tunnels harms your lungs is far from settled.
As the latest controversy about tunnel exhaust stacks and respiratory health plays out in the media, some community members are proposing solutions that just don't make sense.
New Delhi’s pollution is among the worst in the world. Each autumn, when crops are burnt and wind speeds are low, it risks rising to crisis levels.
Jean-Etienne Minh-Duy Poirrier
In November 2016, smog in New Delhi was 16 times above safe levels. An Indian researcher dug into the data to find out why, and how India can keep its capital breathing safely.
We don’t know what the car of the future will look like – but that’s no excuse to delay transport reform.
Australia needs to 'embrace uncertainty' on the future of transport, with flexible, holistically focused policy.