India's capital New Delhi has been plunged into smog, a year after suffering a similar crisis. Without an end to crop burning, the problems with smog will only continue.
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.