Background Ozone is a Major Issue on US West Coast

ENN
Sep 30, 2015, 9:38 am47 pts
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 under proposed stricter U.S. ground-level ozone standards, finds a new NASA-led…

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