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 27 17 0.021 0.032 0.567 0.004 - 62.727 -
Jongno-gu 24 15 0.03 0.035 0.6 0.003 Moderate 59 PM25
Jung-gu 27 18 0.022 0.047 0.7 0.002 Moderate 79 NO2
Yongsan-gu 26 16 0.026 0.023 0.5 0.003 Moderate 61 PM25
Seongdong-gu 19 10 0.021 0.022 0.6 0.004 Moderate 55 PM25
Gwangjin-gu 24 9 0.016 0.028 0.7 0.004 Moderate 53 PM25
Dongdaemun-gu 19 12 0.015 0.035 0.5 0.004 Moderate 58 NO2
Jungnang-gu 23 9 0.02 0.022 0.4 0.006 Moderate 53 PM25
Seongbuk-gu 27 16 0.023 0.032 0.6 0.002 Moderate 59 PM25
Gangbuk-gu 19 12 0.04 0.007 0.4 0.003 Moderate 59 O3
Dobong-gu 25 17 0.022 0.021 0.5 0.003 Moderate 61 PM25
Nowon-gu 26 16 0.032 0.023 0.4 0.003 Moderate 58 PM25
Eunpyung-gu 28 11 0.026 0.024 0.4 0.002 Moderate 56 PM25
Seodaemun-gu 14 12 0.028 0.026 0.4 0.004 Moderate 59 PM25
Mapo-gu 31 23 0.016 0.043 0.6 0.004 Moderate 72 NO2
Yangcheon-gu 30 25 0.017 0.036 0.6 0.004 Moderate 71 PM25
Gangseo-gu 38 13 Being Evaluated 0.034 0.5 0.006 - Being Evaluated Being Evaluated
Guro-gu 31 21 0.005 0.041 0.8 0.006 Moderate 68 NO2
Geumcheon-gu 29 23 0.017 0.033 0.6 0.003 Moderate 65 PM25
Yeongdeungpo-gu 36 22 0.017 0.047 0.7 0.002 Moderate 79 NO2
Dongjak-gu 36 25 0.017 0.044 0.6 0.002 Moderate 73 NO2
Gwanak-gu 35 34 Being Evaluated Being Evaluated Being Evaluated Being Evaluated - Being Evaluated Being Evaluated
Seocho-gu 21 18 0.009 0.042 0.7 0.003 Moderate 70 NO2
Gangnam-gu 43 Being Evaluated 0.015 0.04 0.6 0.005 - Being Evaluated Being Evaluated
Songpa-gu 34 16 0.017 0.029 0.7 0.003 Moderate 55 PM25
Gangdong-gu 21 11 0.023 0.034 0.5 0.003 Moderate 57 NO2