Houston in 2002.
U.S. states need to put in place new ozone air quality standards, but how they are measured – based on peak ozone – doesn't always best reflect a city's overall air quality.
Tonktiti / shutterstock
Sadly the finding that children, especially poorer children, suffer the most from air pollution isn't particularly surprising.
Smog over Mexico City: bad air quality has led to limits on when people can drive their cars in the city.
Mexico City is suffering through an air quality crisis this spring, but institutional corruption is making the proposed solution – restricting car usage – ineffective.
Stephen Bures / Shutterstock
The main mayoral candidates agree air quality is a huge issue, but disagree on policies.
China’s coal use has gone down two years in a row – or has it?
It's a transition the rest of the world is watching: How can we know whether coal use in China – the world's largest emitter – is going up or down?
These backpacked pigeons are patrolling London’s skies.
Pigeon Air Patrol
This low-cost way of monitoring air quality is appealing, but there needs to be acknowledgement of their weaknesses as well as strengths.
So-called 'healthy towns' will address child obesity and dementia, but the real killer remains at large.
NorGal / shutterstock
Poor indoor air quality is responsible for thousands of deaths – here's how to keep yourself healthy.
Pregnant women in three Australian cities are not told that lead exposure during pregnancy is linked to miscarriage and early delivery.
Parents in three Australian states are being given misleading advice about the dangers of lead to babies and small children – including failing to warn pregnant women about miscarriage risks.
Adnan Abidi / Reuters
Air quality in the Indian capital is so bad that the government has instigated a vehicle ban.
Paul Brock Photography/Flickr
From New Year's Eve, to Guy Fawkes night, to Diwali, fireworks are an exciting way to celebrate. But these dazzling displays come at a serious cost to the environment.
Aided by expanded farming in Asia, there’s been a global increase in greenhouse gases from farming.
The Paris climate summit yielded a pact to reduce air pollutants that contribute to global warming but missed a chance to address the interlinked effects of agriculture and climate.
Conflicting evidence means it's tough to tell whether trees helping to clear the air, or if green is not as good as we thought.
Darren Whiteside / Reuters
Leaders in Jakarta want to tackle the haze crisis but they don't have much authority over corrupt local elites.
Smog over car-heavy Los Angeles.
Volkswagen's emissions cheat didn't just anger owners and regulators; the cost to human health from violating air quality rules exceeds US$100 million.
Charles Platiau / Reuters
If some good can come out of the Volkswagen scandal, it's that public will be more clued up about air pollution from cars.
Eleven million cars worldwide could be affected by the scandal.
Volkswagen's cheating allowed its vehicles to pass rigorous emissions testing, giving customers maximum driving performance at the cost of the environment and our health.
Traffic is one of the major sources of pollution worldwide, particularly in Asia’s packed cities.
Outdoor air pollution causes 3.3 million premature deaths a year, mainly in Asia. And without policies to cut particulate pollution from traffic, industry and home biofuels, the deaths could double by 2050.
Kim Kyung Hoon / Reuters
More than 3m people die from air pollution each year, according to a new study but China is awake to the problem.
Hold your breath.
Ng Han Guan/AP/Press Association Images
The poor air quality at major sporting events can have a damaging affect on athletes' performance and health.