From AGU's blogs: Not just rain: thunderstorms also pour down ozone
A new study in Geophysical Research Letters offers for the first time unequivocal evidence that large storms move significant amounts of ozone from the stratosphere down to the troposphere, the lowest part of the atmosphere. The finding has implications for global climate because tropospheric ozone is a powerful greenhouse gas as well as a pollutant that affects human health and the environment.
From Eos.org : Urbanization and Air Pollution: Then and Now
Analysis of decades of mitigation efforts in Los Angeles demonstrates that air quality in megacities can be greatly improved.
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Geophysical Research Letters