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Air Quality Information


◆ 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 6 2 0.025 0.009 0.258 0.002 - 41.875 -
Jongno-gu 5 2 0.024 0.011 0.3 0.002 Good 41 O3
Jung-gu 8 4 Being Evaluated Being Evaluated Being Evaluated Being Evaluated - Being Evaluated Being Evaluated
Yongsan-gu 6 2 0.023 0.006 0.2 0.003 Good 39 O3
Seongdong-gu 6 3 0.028 0.010 0.2 0.002 Good 47 O3
Gwangjin-gu 6 1 0.020 0.005 0.4 0.002 Good 34 O3
Dongdaemun-gu 6 3 0.019 0.015 0.3 0.002 Good 32 O3
Jungnang-gu 6 6 0.025 0.007 0.3 0.002 Good 42 O3
Seongbuk-gu 9 3 0.013 0.023 0.3 0.003 Good 39 NO2
Gangbuk-gu 7 2 0.019 0.006 0.3 0.002 Good 32 O3
Dobong-gu 3 2 0.027 0.004 0.2 0.003 Good 46 O3
Nowon-gu 8 3 0.021 0.012 0.3 0.002 Good 36 O3
Eunpyung-gu 5 1 0.034 0.004 0.1 0.003 Moderate 54 O3
Seodaemun-gu 3 4 0.031 0.002 0.2 0.002 Moderate 51 O3
Mapo-gu 5 1 0.025 0.008 0.3 0.002 Good 42 O3
Yangcheon-gu 7 2 0.022 0.015 0.3 0.003 Good 37 O3
Gangseo-gu 3 2 0.028 0.007 0.2 0.002 Good 47 O3
Guro-gu 7 1 0.027 0.007 0.2 0.002 Good 46 O3
Geumcheon-gu 6 2 0.025 0.007 0.3 0.002 Good 42 O3
Yeongdeungpo-gu 7 1 0.022 0.012 0.3 0.002 Good 37 O3
Dongjak-gu 10 3 0.023 0.008 0.2 0.002 Good 39 O3
Gwanak-gu 7 1 0.026 0.009 0.3 0.002 Good 44 O3
Seocho-gu 4 1 0.028 0.008 0.1 0.002 Good 47 O3
Gangnam-gu 6 3 0.028 0.007 0.3 0.003 Good 47 O3
Songpa-gu 7 3 0.025 0.011 0.3 0.002 Good 42 O3
Gangdong-gu 7 3 0.025 0.010 0.3 0.002 Good 42 O3