2017 Carbon Monoxide Government Ozone 
Environment, Law, and History
DECEMBER 31, 2020
Clean Air Act programs have lowered levels of six common pollutants — particles, ozone, lead, carbon monoxide, nitrogen dioxide and sulfur dioxide — as well as numerous toxic pollutants. This progress reflects efforts by state, local and tribal governments; EPA; private sector companies; environmental groups and others.
Environmental Progress
SEPTEMBER 12, 2020
Governments and farmers have known what “biosecurity” measures to take for decades, and enacted them, partly, in response to the 2005 avian flu (H5N1) epidemic. Between 1980 and 2018, US carbon monoxide levels decreased by 83 percent, lead by 99 percent, nitrogen dioxide by 61 percent, ozone by 31 percent, and sulfur dioxide by 91 percent.
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