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 9 0.006 0.03 0.484 0.004 - 50.208 -
Jongno-gu 17 9 0.007 0.031 0.5 0.004 Moderate 51 NO2
Jung-gu 21 10 0.006 0.033 0.5 0.003 Moderate 55 NO2
Yongsan-gu 14 10 0.003 0.026 0.4 0.004 Good 44 NO2
Seongdong-gu 18 3 0.005 0.022 0.6 0.004 Good 39 PM10
Gwangjin-gu 16 7 0.012 0.032 0.5 0.004 Moderate 53 NO2
Dongdaemun-gu 19 8 0.005 0.03 0.4 0.004 Moderate 51 NO2
Jungnang-gu 17 5 0.007 0.027 0.4 0.006 Good 46 NO2
Seongbuk-gu 28 13 0.005 0.032 0.5 0.003 Moderate 53 NO2
Gangbuk-gu 10 4 Being Evaluated 0.027 0.4 0.003 - Being Evaluated Being Evaluated
Dobong-gu 17 8 0.006 0.029 0.5 0.004 Good 49 NO2
Nowon-gu 26 12 0.005 0.038 0.6 0.002 Moderate 63 NO2
Eunpyung-gu 15 13 0.01 0.024 0.6 0.003 Good 41 NO2
Seodaemun-gu 23 5 0.008 0.03 0.4 0.005 Moderate 51 NO2
Mapo-gu 16 12 0.007 0.03 0.5 0.003 Moderate 51 NO2
Yangcheon-gu 20 12 0.004 0.035 0.5 0.003 Moderate 58 NO2
Gangseo-gu 30 13 0.006 0.036 0.4 0.006 Moderate 60 NO2
Guro-gu 25 12 0.004 0.022 0.5 0.005 Good 43 PM25
Geumcheon-gu 17 12 0.004 0.034 0.6 0.004 Moderate 57 NO2
Yeongdeungpo-gu 24 7 0.006 0.034 0.6 0.005 Moderate 57 NO2
Dongjak-gu 22 11 0.005 0.034 0.5 0.004 Moderate 57 NO2
Gwanak-gu 20 8 0.004 0.034 0.5 0.005 Moderate 57 NO2
Seocho-gu 22 4 0.005 0.023 0.5 0.005 Good 39 PM10
Gangnam-gu 18 11 0.003 0.028 0.4 0.004 Good 47 NO2
Songpa-gu 22 11 0.003 0.025 0.4 0.004 Good 42 NO2
Gangdong-gu 21 7 0.003 0.024 0.4 0.003 Good 41 PM10