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Air Quality


◆ 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 10 4 0.049 0.007 0.32 0.003 - 66.24 -
Jongno-gu 11 3 0.049 0.008 0.3 0.003 Moderate 66 O3
Jung-gu 10 3 0.051 0.009 0.3 0.003 Moderate 68 O3
Yongsan-gu 10 4 0.041 0.008 0.3 0.002 Moderate 60 O3
Seongdong-gu 13 3 0.053 0.010 0.3 0.002 Moderate 70 O3
Gwangjin-gu 9 5 0.044 0.005 0.4 0.003 Moderate 62 O3
Dongdaemun-gu 9 4 0.053 0.005 0.3 0.003 Moderate 70 O3
Jungnang-gu 9 3 0.053 0.005 0.3 0.002 Moderate 70 O3
Seongbuk-gu 8 3 0.047 0.009 0.3 0.003 Moderate 65 O3
Gangbuk-gu 11 4 0.049 0.006 0.3 0.002 Moderate 66 O3
Dobong-gu 14 3 0.043 0.004 0.4 0.002 Moderate 61 O3
Nowon-gu 8 9 0.049 0.005 0.3 0.002 Moderate 66 O3
Eunpyung-gu 10 7 0.058 0.005 0.4 0.002 Moderate 74 O3
Seodaemun-gu 9 4 0.047 0.004 0.3 0.003 Moderate 65 O3
Mapo-gu 12 5 0.051 0.014 0.3 0.002 Moderate 68 O3
Yangcheon-gu 10 4 0.052 0.007 0.3 0.004 Moderate 69 O3
Gangseo-gu 7 3 0.050 0.008 0.3 0.002 Moderate 67 O3
Guro-gu 6 6 0.050 0.005 0.4 0.003 Moderate 67 O3
Geumcheon-gu 11 6 0.044 0.009 0.3 0.002 Moderate 62 O3
Yeongdeungpo-gu 13 5 0.047 0.008 0.3 0.003 Moderate 65 O3
Dongjak-gu 12 6 0.044 0.006 0.3 0.003 Moderate 62 O3
Gwanak-gu 9 2 0.060 0.006 0.3 0.002 Moderate 76 O3
Seocho-gu 8 1 0.046 0.007 0.3 0.003 Moderate 64 O3
Gangnam-gu 7 4 0.050 0.006 0.3 0.003 Moderate 67 O3
Songpa-gu 12 5 0.049 0.007 0.4 0.002 Moderate 66 O3
Gangdong-gu 8 4 0.041 0.005 0.3 0.002 Moderate 60 O3