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Understand NO2 pollution standards in India and Seoul. NO2 levels are measured in ppm and mg/m3, with yearly standards set at 0.02 ppm and 40 μg/m3 respectively. Visit official sites for more info.
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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