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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 52 27 0.04 0.025 0.436 0.003 - 78.52 -
Jongno-gu 50 27 0.044 0.020 0.5 0.006 Moderate 80 PM10
Jung-gu 58 29 0.036 0.032 0.5 0.003 Moderate 83 PM10
Yongsan-gu 45 24 0.032 0.026 0.4 0.003 Moderate 76 PM10
Seongdong-gu 51 26 0.049 0.029 0.5 0.003 Moderate 79 PM10
Gwangjin-gu 57 20 0.029 0.025 0.5 0.004 Moderate 81 PM10
Dongdaemun-gu 55 26 0.041 0.022 0.4 0.003 Moderate 79 PM10
Jungnang-gu 59 29 0.035 0.027 0.5 0.003 Moderate 77 PM10
Seongbuk-gu 53 26 0.037 0.028 0.5 0.003 Moderate 79 PM10
Gangbuk-gu 58 30 0.050 0.011 0.4 0.002 Moderate 74 PM10
Dobong-gu 57 29 0.049 0.011 0.4 0.004 Moderate 79 PM10
Nowon-gu 52 33 0.049 0.009 0.5 0.003 Moderate 78 PM10
Eunpyung-gu 48 27 0.034 0.028 0.4 0.003 Moderate 76 PM10
Seodaemun-gu 35 25 0.041 0.019 0.4 0.005 Moderate 72 PM25
Mapo-gu 56 32 0.036 0.027 0.4 0.003 Moderate 77 PM10
Yangcheon-gu 60 33 0.033 0.029 0.5 0.003 Moderate 83 PM10
Gangseo-gu 62 33 0.038 0.027 0.5 0.003 Moderate 82 PM10
Guro-gu 55 26 0.041 0.027 0.4 0.004 Moderate 84 PM10
Geumcheon-gu 44 19 0.054 0.015 0.3 0.003 Moderate 71 PM10
Yeongdeungpo-gu 55 31 0.024 0.043 0.5 0.003 Moderate 77 PM10
Dongjak-gu 25 19 0.044 0.026 0.4 0.003 Moderate 78 PM10
Gwanak-gu 44 26 0.038 0.031 0.4 0.003 Moderate 73 PM10
Seocho-gu 57 18 0.046 0.024 0.3 0.004 Moderate 87 PM10
Gangnam-gu 45 24 0.042 0.028 0.4 0.003 Moderate 76 PM10
Songpa-gu 52 25 0.044 0.031 0.5 0.003 Moderate 79 PM10
Gangdong-gu 66 37 0.035 0.026 0.4 0.003 Moderate 83 PM10


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