The District Department of Energy and Environment found that ozone levels in 2020 were exceptionally low due to a reduction in traffic congestion. Author: John Henry. Published: 2 ...
source https://www.wusa9.com/article/tech/science/environment/dc-air-quality-improved-during-the-pandemic/65-4ed12583-c4c3-4298-a89a-bad0e8294a07
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