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Air Quality Information

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◆ Forecast Standards

Category Fine particles(PM-2.5) Coarse Particles(PM-10) Ozone(O₃) Nitrogen Dioxide(NO₂) Carbon Monoxide(CO) Sulfur Dioxide(SO₂) Comprehensive Air Quality Index
Good 0~15 0~30 0~0.030 0~0.030 0~2.00 0~0.020 0~50
Moderate 16~35 31~80 0.031~0.090 0.031~0.060 2.01~9.00 0.021~0.050 51~100
Unhealthy 36~75 81~150 0.091~0.150 0.061~0.200 9.01~15.00 0.051~0.150 101~250
Very Unhealthy 76~ 151~ 0.151~ 0.201~ 15.01~ 0.151~ 251~
Being Evaluated

◆ Alert Standards

Air Pollutant Warning Level Alert Criteria Cancellation Criteria
Ozone Advisory Hourly average of 0.12ppm or higher Hourly average below 0.12ppm
Warning Hourly average of 0.30ppm or higher Hourly average below 0.30ppm
→ Change alert level to advisory
Serious Warning Hourly average of 0.50ppm or higher Hourly average below 0.50ppm
→ Change alert level to warning
Coarse Particles Advisory Hourly average of 150㎍/㎥ or higher for 2 hours or more Hourly average below 100㎍/㎥
Warning Hourly average of 300㎍/㎥ or higher for 2 hours or more Hourly average below 150㎍/㎥
→ Change alert level to advisory
Fine particles Advisory Hourly average of 90㎍/㎥ or higher for 2 hours or more Hourly average below 50㎍/㎥
Warning Hourly average of 180㎍/㎥ or higher for 2 hours or more Hourly average below 90㎍/㎥
→ Change alert level to advisory

◆ Measured Amount of Air Pollutants

Category Station Coarse Particles(㎍/㎥) Fine particles(㎍/㎥) Ozone(ppm) Nitrogen Dioxide(ppm) Carbon Monoxide(ppm) Sulfur Dioxide(ppm) Comprehensive Air Quality Index
1Hour 1Hour 1Hour 1Hour 1Hour 1Hour Level Index Determinant Pollutant
City Air Quality Average for Seoul 62 42 0.015 0.045 0.664 0.005 - 85.696 -
Jongno-gu 52 33 0.016 0.050 0.7 0.006 Moderate 84 NO2
Jung-gu 53 35 0.018 0.050 0.7 0.005 Moderate 84 NO2
Yongsan-gu 49 37 0.007 0.058 0.7 0.005 Moderate 97 NO2
Seongdong-gu 65 44 0.022 0.043 0.6 0.005 Moderate 82 PM10
Gwangjin-gu 61 45 0.023 0.034 0.9 0.006 Moderate 84 PM25
Dongdaemun-gu 52 34 0.018 0.046 0.6 0.005 Moderate 77 NO2
Jungnang-gu 46 39 0.023 0.035 0.5 0.007 Moderate 76 PM25
Seongbuk-gu 69 42 0.014 0.049 1.0 0.005 Moderate 82 PM10
Gangbuk-gu 61 35 0.022 0.026 0.7 0.004 Moderate 76 PM10
Dobong-gu 65 43 0.011 0.034 0.7 0.006 Moderate 77 PM10
Nowon-gu 61 40 0.011 0.045 0.7 0.005 Moderate 78 PM25
Eunpyung-gu 74 44 0.030 0.042 0.5 0.006 Moderate 77 PM10
Seodaemun-gu 86 56 Being Evaluated 0.022 0.8 0.007 - Being Evaluated Being Evaluated
Mapo-gu 80 53 0.016 0.038 0.6 0.004 Moderate 95 PM25
Yangcheon-gu 64 39 0.007 Being Evaluated 0.8 0.007 - Being Evaluated Being Evaluated
Gangseo-gu 70 41 0.014 0.061 0.7 0.006 Unhealthy 101 NO2
Guro-gu 72 51 0.012 0.049 0.5 0.004 Moderate 94 PM25
Geumcheon-gu 55 40 0.019 0.042 0.7 0.005 Moderate 76 PM25
Yeongdeungpo-gu 70 51 0.012 0.050 0.5 0.004 Moderate 92 PM25
Dongjak-gu 58 41 0.012 0.063 0.7 0.005 Unhealthy 104 NO2
Gwanak-gu 73 50 0.016 0.060 0.6 0.004 Moderate 100 NO2
Seocho-gu 57 45 0.011 0.049 0.6 0.003 Moderate 84 PM10
Gangnam-gu 46 34 0.010 0.038 0.5 0.006 Moderate 74 PM25
Songpa-gu 65 43 0.010 0.052 0.7 0.004 Moderate 87 NO2
Gangdong-gu 52 36 0.007 0.054 0.6 0.004 Moderate 90 NO2