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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 44 21 0.04 0.02 0.424 0.003 - 62.24 -
Jongno-gu 42 21 0.033 0.021 0.4 0.004 Moderate 58 PM10
Jung-gu 37 22 0.037 0.017 0.4 0.004 Moderate 56 PM25
Yongsan-gu 42 16 0.044 0.018 0.5 0.003 Moderate 62 PM10
Seongdong-gu 39 19 0.046 0.021 0.4 0.004 Moderate 64 O3
Gwangjin-gu 48 26 0.036 0.018 0.5 0.002 Moderate 59 PM10
Dongdaemun-gu 36 15 0.039 0.022 0.4 0.003 Moderate 58 O3
Jungnang-gu 47 20 0.036 0.023 0.4 0.003 Moderate 59 PM10
Seongbuk-gu 43 22 0.043 0.020 0.4 0.003 Moderate 61 O3
Gangbuk-gu 46 19 0.043 0.023 0.3 0.002 Moderate 61 PM10
Dobong-gu 39 16 0.049 0.014 0.5 0.002 Moderate 66 O3
Nowon-gu 46 21 0.037 0.014 0.4 0.004 Moderate 58 PM10
Eunpyung-gu 52 23 0.044 0.017 0.3 0.004 Moderate 65 PM10
Seodaemun-gu 52 25 0.043 0.018 0.6 0.003 Moderate 68 PM10
Mapo-gu 39 18 0.037 0.023 0.5 0.004 Moderate 60 PM10
Yangcheon-gu 43 21 0.036 0.020 0.4 0.004 Moderate 65 PM10
Gangseo-gu 41 19 0.041 0.017 0.5 0.006 Moderate 62 PM10
Guro-gu 53 22 0.052 0.023 0.3 0.003 Moderate 74 PM10
Geumcheon-gu 46 25 0.031 0.026 0.5 0.004 Moderate 60 PM10
Yeongdeungpo-gu 36 18 0.043 0.018 0.4 0.003 Moderate 61 O3
Dongjak-gu 55 25 0.031 0.023 0.4 0.003 Moderate 71 PM10
Gwanak-gu 40 16 0.036 0.025 0.5 0.004 Moderate 63 PM10
Seocho-gu 45 26 0.050 0.020 0.3 0.004 Moderate 67 O3
Gangnam-gu 42 23 0.042 0.023 0.4 0.003 Moderate 61 O3
Songpa-gu 46 19 0.035 0.029 0.5 0.003 Moderate 59 PM10
Gangdong-gu 47 21 0.039 0.018 0.4 0.003 Moderate 58 PM10