News tagged with pollution levels

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Background ozone a major issue in US West

Levels of "background ozone"—ozone pollution present in a region but not originating from local, human-produced sources—are high enough in Northern California and Nevada that they leave little room for local ozone production ...

dateSep 30, 2015 in Environment
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China air pollution levels fall: Greenpeace

Air pollution levels in China's cities improved in the first six months of this year, environmental campaign group Greenpeace said Wednesday, but remained far worse than global and domestic standards.

dateJul 22, 2015 in Environment
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