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 38 20 0.011 0.034 0.471 0.005 - 60.913 -
Jongno-gu 28 18 0.013 0.039 0.5 0.003 Moderate 65 NO2
Jung-gu 30 18 0.009 0.022 0.5 0.004 Moderate 53 PM25
Yongsan-gu 43 22 0.007 0.037 0.4 0.005 Moderate 62 NO2
Seongdong-gu 45 17 0.006 0.039 0.7 0.004 Moderate 65 NO2
Gwangjin-gu 28 16 0.013 0.033 0.5 0.004 Moderate 55 NO2
Dongdaemun-gu 26 12 0.014 0.033 0.4 0.004 Moderate 55 NO2
Jungnang-gu 33 10 0.013 0.027 0.3 0.004 Moderate 56 PM25
Seongbuk-gu 37 21 0.012 0.037 0.5 0.003 Moderate 62 NO2
Gangbuk-gu 25 14 0.019 0.026 0.4 0.003 Good 49 PM25
Dobong-gu 43 19 0.015 0.027 0.4 0.003 Moderate 58 PM25
Nowon-gu 31 18 0.017 0.031 0.4 0.003 Moderate 55 PM25
Eunpyung-gu 38 20 0.015 0.036 0.4 0.001 Moderate 60 NO2
Seodaemun-gu 34 15 0.017 0.032 0.5 0.005 Moderate 58 PM25
Mapo-gu 28 20 0.012 0.034 0.5 0.004 Moderate 58 PM25
Yangcheon-gu 41 30 0.006 0.035 0.5 0.005 Moderate 66 PM25
Gangseo-gu 48 18 0.007 0.038 0.4 0.009 Moderate 63 NO2
Guro-gu 48 25 0.011 0.025 0.5 0.013 Moderate 59 PM10
Geumcheon-gu Being Evaluated Being Evaluated Being Evaluated Being Evaluated Being Evaluated Being Evaluated - Being Evaluated Being Evaluated
Yeongdeungpo-gu 39 24 0.014 0.042 0.6 0.005 Moderate 70 NO2
Dongjak-gu 39 23 0.007 0.043 0.5 0.005 Moderate 72 NO2
Gwanak-gu 46 32 0.008 0.039 0.4 0.009 Moderate 69 PM25
Seocho-gu 45 20 0.009 0.038 0.6 0.006 Moderate 63 NO2
Gangnam-gu 42 22 0.005 0.04 0.4 0.005 - Being Evaluated Being Evaluated
Songpa-gu 53 21 0.007 0.042 0.6 0.005 Moderate 70 NO2
Gangdong-gu 40 16 0.01 0.032 0.4 0.003 Moderate 58 PM10