Study finds imported ozone blunted Europe, US gains from NOx cuts

PHYSorg
Jan 29, 2026, 10:20 pm98 pts
In North America and Europe, emissions of ozone precursors such as nitrogen oxides (NOx) and volatile organic compounds (VOCs) declined by half between 2000 and 2018. However, the ozone content of the air—and thus the risk to human health—has not decreased proportionally. Until now, theories about the…

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