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Air Quality Information

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◆ 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 0~2.00 0~0.020 0~50
Moderate 16~35 31~80 0.031~0.090 0.031~0.060 2.01~9.00 0.021~0.050 51~100
Unhealthy 36~75 81~150 0.091~0.150 0.061~0.200 9.01~15.00 0.051~0.150 101~250
Very Unhealthy 76~ 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 26 18 0.014 0.03 0.513 0.004 - 59.478 -
Jongno-gu 24 19 0.017 0.025 0.6 0.004 Moderate 63 PM25
Jung-gu 23 17 0.016 0.025 0.5 0.004 Moderate 59 PM25
Yongsan-gu 21 20 0.008 0.031 0.5 0.003 Moderate 63 PM25
Seongdong-gu 23 19 0.017 0.027 0.4 0.004 Moderate 59 PM25
Gwangjin-gu 27 12 0.020 0.016 0.4 0.003 Moderate 52 PM25
Dongdaemun-gu 26 15 0.011 0.033 0.6 0.003 Moderate 56 PM25
Jungnang-gu 29 13 0.010 0.035 0.5 0.005 Moderate 58 NO2
Seongbuk-gu 25 17 0.019 0.027 0.5 0.003 Moderate 58 PM25
Gangbuk-gu 31 21 0.018 0.034 0.5 0.003 Moderate 61 PM25
Dobong-gu 20 15 0.021 0.020 0.5 0.003 Moderate 52 PM25
Nowon-gu 24 22 0.016 0.028 0.5 0.004 Moderate 61 PM25
Eunpyung-gu 21 14 Being Evaluated Being Evaluated Being Evaluated Being Evaluated - Being Evaluated Being Evaluated
Seodaemun-gu 21 14 0.014 0.026 0.9 0.006 Good 49 PM25
Mapo-gu 25 15 0.012 0.031 0.5 0.003 Moderate 56 PM25
Yangcheon-gu 27 17 0.014 0.032 0.5 0.004 Moderate 61 PM25
Gangseo-gu 28 16 0.018 0.029 0.5 0.008 - Being Evaluated Being Evaluated
Guro-gu 23 14 0.021 0.024 0.3 0.003 Moderate 56 PM25
Geumcheon-gu 28 23 0.012 0.031 0.5 0.003 Moderate 66 PM25
Yeongdeungpo-gu 26 19 0.011 0.030 0.7 0.004 Moderate 51 PM25
Dongjak-gu 33 23 0.008 0.039 0.5 0.003 Moderate 68 PM25
Gwanak-gu 31 17 0.012 0.033 0.5 0.003 Moderate 55 NO2
Seocho-gu 27 18 0.016 0.039 0.3 0.003 Moderate 65 NO2
Gangnam-gu 31 23 0.013 0.034 0.5 0.003 Moderate 66 PM25
Songpa-gu 26 13 0.010 0.037 0.6 0.003 Moderate 62 NO2
Gangdong-gu 36 26 0.007 0.040 0.5 0.003 Moderate 71 PM25