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At the high temperatures in internal combustion engines, some of the nitrogen in the air actually burns, resulting in the formation NO or NO 2 , which are collectively called NOx. NOx plays a role in forming ground level ozone and final particulates (PM2.5), both of which are human health hazards. grams per mile (gpm) for NOx.
This body will review the EPA’s scientific review of current ozone pollution standards. In 2019, the Trump administration opted to keep ozone pollution standards the same. This proposed rule contrasts the Fish and Wildlife Service’s 2004 and 2009 determinations that the species did not warrant protections.
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