US ozone pollution has fallen in recent decades, but exposure to low levels of ozone still has serious effects on human health and well-being.
US national parks protect some of America's most spectacular outdoor settings. But new research shows that ozone pollution levels in the parks are roughly as bad as in major cities.
New research is spotlighting personal care products, such as shampoos and skin lotions, as a significant source of chemicals that contribute to urban air pollution.
Air pollution could be the next battleground between California and the Trump administration, which is reviewing the Golden State's special legal authority to regulate tailpipe emissions.
While India struggles for answers to its urban air pollution crisis, Beijing is moving forward with strong resolve and effective policy.
Will the evidence finally convince polluted cities to clean up their act?
The city of Phalodi has set a temperature record for India, hitting 51℃. Until now, India's smog problem has curbed extreme temperatures. But that could be about to change.
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.
While Indonesia has taken steps to address the worst forest fires in living memory, a new palm oil alliance with Malaysia threatens to take a giant leap back.
The US has stricter ozone rules but the limits lag guidelines set by some other countries and more coordination in regulation is needed to address air pollution globally.
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.