The air quality in Nepal's capital is horrible for residents there, but we're now seeing what the fuel burning — and the dreaded black carbon — is doing to the glaciers nearby.
China has a trash problem. Its landfills are brimming, often with wasted food. So the government is trying to attack the problem with a "clean plate" campaign and more incinerators. But burning the waste has people up in arms.
The air is clearing again in Paris after a smog emergency led the government to take extraordinary measures to get people out of their cars.