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POLLUTION STANDARDS. NO 2 : 1 ppm ≈ 2 mg/m 3 Yearly standard: 0.02 ppm ≈ 40 μ g/m 3. India : http://mpcb.gov.in/air%20quality/air_caaqms_05.php Seoul: http://www.airkorea.or.kr/airkorea/eng/index.htm.
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NO2: 1 ppm ≈ 2 mg/m3 Yearly standard: 0.02 ppm ≈ 40 μg/m3
India : http://mpcb.gov.in/air%20quality/air_caaqms_05.php Seoul: http://www.airkorea.or.kr/airkorea/eng/index.htm