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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 69 46 0.019 0.036 0.788 0.004 - 88 -
Jongno-gu 68 46 0.020 0.029 0.7 0.004 Moderate 91 PM25
Jung-gu 67 52 0.019 0.031 0.7 0.004 Moderate 92 PM25
Yongsan-gu 69 48 0.015 0.031 0.7 0.003 Moderate 88 PM25
Seongdong-gu 67 39 0.012 0.044 0.7 0.004 Moderate 84 PM10
Gwangjin-gu 67 46 0.003 0.051 1.0 0.003 Moderate 85 NO2
Dongdaemun-gu 61 40 0.019 0.034 0.6 0.004 Moderate 81 PM25
Jungnang-gu 64 33 0.017 0.041 0.9 0.005 Moderate 83 PM10
Seongbuk-gu 57 40 0.002 0.063 1.2 0.003 Unhealthy 104 NO2
Gangbuk-gu 67 42 0.021 0.032 0.6 0.003 Moderate 93 PM10
Dobong-gu 58 35 0.024 0.031 0.7 0.003 Moderate 76 PM10
Nowon-gu 60 51 0.033 0.016 0.8 0.006 Moderate 91 PM25
Eunpyung-gu 66 46 0.017 0.033 1.0 0.003 Moderate 87 PM10
Seodaemun-gu 69 50 0.021 0.031 1.1 0.005 Moderate 86 PM10
Mapo-gu 71 52 0.011 0.045 0.8 0.004 Moderate 89 PM25
Yangcheon-gu 81 52 0.026 0.030 0.8 0.004 Moderate 89 PM25
Gangseo-gu 87 49 0.031 0.023 0.7 0.005 Moderate 91 PM10
Guro-gu 67 46 0.032 0.024 0.5 0.005 Moderate 84 PM10
Geumcheon-gu 69 50 0.025 0.028 0.7 0.004 Moderate 89 PM25
Yeongdeungpo-gu 64 46 0.027 0.027 1.0 0.004 Moderate 84 PM25
Dongjak-gu 86 54 0.015 0.040 0.7 0.003 Moderate 82 PM25
Gwanak-gu 72 45 0.024 0.032 0.8 0.004 Moderate 85 PM10
Seocho-gu 78 50 0.030 0.030 0.5 0.003 Moderate 88 PM10
Gangnam-gu 67 43 0.016 0.042 0.8 0.004 Moderate 84 PM25
Songpa-gu 67 45 0.008 0.050 0.9 0.004 Moderate 87 PM25
Gangdong-gu 73 46 0.003 0.066 0.8 0.004 Unhealthy 107 NO2