National Emissions Standards for Hazardous Air Pollutants
（重定向自Hazardous Air Pollutant）
The National Emissions Standards for Hazardous Air Pollutants, also using the acronym NESHAP, are emissions standards set by the United States Environmental Protection Agency—EPA. The standards are for air pollutants not covered by National Ambient Air Quality Standards—NAAQS, that may cause an increase in fatalities or in serious, irreversible, or incapacitating illness.