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 28 17 0.019 0.034 0.468 0.005 - 61.292 -
Jongno-gu 28 15 0.01 0.046 0.6 0.004 Moderate 77 NO2
Jung-gu 24 14 0.018 0.046 0.5 0.004 Moderate 77 NO2
Yongsan-gu 22 16 0.009 0.035 0.3 0.004 Moderate 58 NO2
Seongdong-gu 27 18 0.008 0.035 0.2 0.004 Moderate 61 PM10
Gwangjin-gu 28 17 0.01 0.041 0.5 0.004 Moderate 68 NO2
Dongdaemun-gu 29 16 0.011 0.039 0.5 0.005 Moderate 65 NO2
Jungnang-gu 38 20 0.01 0.042 0.4 0.006 Moderate 70 NO2
Seongbuk-gu 42 25 0.01 0.039 0.5 0.003 Moderate 65 NO2
Gangbuk-gu 18 12 0.024 0.022 0.4 0.003 Good 41 O3
Dobong-gu 26 19 0.02 0.03 0.6 0.004 Moderate 52 PM25
Nowon-gu 31 17 0.015 0.037 0.5 0.003 Moderate 62 NO2
Eunpyung-gu 24 16 0.018 0.034 0.5 0.006 Moderate 57 NO2
Seodaemun-gu 37 18 0.015 0.037 0.6 0.006 Moderate 62 NO2
Mapo-gu 31 23 0.024 0.032 0.5 0.005 Moderate 55 PM25
Yangcheon-gu 25 21 0.021 0.03 0.4 0.007 Moderate 61 PM25
Gangseo-gu 31 11 0.044 0.032 0.4 0.011 Moderate 62 O3
Guro-gu 25 16 0.028 0.022 0.5 0.007 Moderate 53 PM25
Geumcheon-gu 28 17 0.02 0.04 0.4 0.005 Moderate 67 NO2
Yeongdeungpo-gu 25 14 0.03 0.03 0.7 0.006 Moderate 54 PM10
Dongjak-gu 22 15 0.036 0.021 0.4 0.004 Moderate 56 O3
Gwanak-gu 29 Being Evaluated 0.025 0.031 0.5 0.005 - Being Evaluated Being Evaluated
Seocho-gu 23 15 0.036 0.026 0.4 0.007 Moderate 56 O3
Gangnam-gu 27 23 0.013 0.034 0.4 0.005 Moderate 57 NO2
Songpa-gu 32 15 0.003 0.044 0.5 0.004 Moderate 73 NO2
Gangdong-gu 35 17 0.007 0.037 0.5 0.003 Moderate 62 NO2