Air Quality Information

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Information as of 21 Feb, 2017

◆ 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 0~0.200 0~0.020 0~50
Moderate 16~50 31~80 0.031~0.090 0.031~0.060 2.01~9.00 0.021~0.050 51~100
Unhealthy 51~100 81~150 0.091~0.150 0.061~0.200 9.01~15.00 0.051~0.150 101~250
Very Unhealthy 101~ 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 20 10 0.022 0.01 0.4 0.004 - 41.8 -
Jongno-gu 19 12 0.024 0.008 0.4 0.004 Good 41 O3
Jung-gu 20 13 0.024 0.008 0.4 0.003 Good 41 O3
Yongsan-gu 14 10 0.021 0.009 0.2 0.003 Good 36 O3
Seongdong-gu 25 14 0.02 0.01 0.4 0.004 Good 49 PM10
Gwangjin-gu 21 11 0.029 0.012 0.4 0.004 Good 49 O3
Dongdaemun-gu 17 6 0.015 0.008 0.4 0.004 Good 37 PM10
Jungnang-gu 19 10 0.019 0.013 0.4 0.006 Good 37 PM10
Seongbuk-gu 22 7 0.023 0.009 0.6 0.004 Good 39 PM10
Gangbuk-gu 18 7 0.028 0.007 0.3 0.003 Good 47 O3
Dobong-gu 17 6 0.024 0.005 0.3 0.003 Good 41 O3
Nowon-gu 27 11 0.024 0.01 0.3 0.005 Good 47 PM10
Eunpyung-gu 24 5 0.026 0.011 0.9 0.006 Good 46 PM10
Seodaemun-gu 20 11 0.02 0.012 0.5 0.003 Good 37 PM10
Mapo-gu 11 9 0.023 0.006 0.4 0.004 Good 39 O3
Yangcheon-gu 27 14 0.019 0.015 0.4 0.003 Good 49 PM10
Gangseo-gu 18 11 0.027 0.011 0.6 0.004 Good 46 O3
Guro-gu 22 13 0.016 0.01 0.4 0.005 Good 36 PM10
Geumcheon-gu 18 10 0.022 0.011 0.3 0.003 Good 37 O3
Yeongdeungpo-gu 21 8 0.021 0.012 0.5 0.006 Good 49 PM10
Dongjak-gu 21 14 0.021 0.012 0.3 0.003 Good 46 PM25
Gwanak-gu 16 4 0.018 0.012 0.3 0.007 Good 31 PM10
Seocho-gu 24 10 0.022 0.007 0.3 0.004 Good 42 PM10
Gangnam-gu 19 10 0.018 0.011 0.3 0.004 Good 36 PM10
Songpa-gu 18 10 0.024 0.009 0.3 0.004 Good 46 PM10
Gangdong-gu 22 9 0.02 0.015 0.4 0.005 Good 41 PM10