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For sulfur dioxide (SO 2), the guidelines stipulate concentrations not exceeding 40 μg/m 3 24-hour mean. [2] For carbon monoxide concentrations not exceeding 4 mg/m 3 24-hour mean. [2] Up to 30 % of Europeans living in cities are exposed to air pollutant levels exceeding EU air quality standards.
Nitrogen oxides (NO x): The EPA first set primary and secondary standards for the oxides of nitrogen in 1971. Among these are nitric oxide (NO), nitrous oxide (N 2 O), and nitrogen dioxide (NO 2), all of which are covered in the NAAQS.
The National Ambient Air Quality Standards (NAAQS) govern how much ground-level ozone (O 3), carbon monoxide (CO), particulate matter (PM 10, PM 2.5), lead (Pb), sulfur dioxide (SO 2), and nitrogen dioxide (NO 2) are allowed in the outdoor air. [6] The NAAQS set the acceptable levels of certain air pollutants in the ambient air in the United ...
Ambient air quality criteria, or standards, are concentrations of pollutants in the air, and typically refer to outdoor air.The criteria are specified for a variety of reasons including for the protection of human health, buildings, crops, vegetation, ecosystems, as well as for planning and other purposes.
Nitrogen dioxide is a chemical compound with the formula NO 2. One of several nitrogen oxides, ... and NIOSH has set exposure limits and safety standards. [6]
Many countries monitor ground-level ozone, particulates, sulfur dioxide, carbon monoxide and nitrogen dioxide, and calculate air quality indices for these pollutants. [12] The definition of the AQI in a particular nation reflects the discourse surrounding the development of national air quality standards in that nation. [13]
As an example, the United States Environmental Protection Agency has developed the National Ambient Air Quality Standards (NAAQS) [6] NAAQS set attainment thresholds for sulfur dioxide, particulate matter (PM 10 and PM 2.5), carbon monoxide, ozone, nitrogen oxides NO x, and lead (Pb) in outdoor air throughout the United States.
The list can be found on Wikipedia at National Emissions Standards for Hazardous Air Pollutants, and on EPA at . Subcategories. ... Nitrogen dioxide poisoning; P.