Air Quality Information

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Information as of 21 Feb, 2017

◆ 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 0~0.200 0~0.020 0~50
Moderate 16~50 31~80 0.031~0.090 0.031~0.060 2.01~9.00 0.021~0.050 51~100
Unhealthy 51~100 81~150 0.091~0.150 0.061~0.200 9.01~15.00 0.051~0.150 101~250
Very Unhealthy 101~ 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 59 31 0.035 0.017 0.428 0.004 - 89.72 -
Jongno-gu 66 40 0.042 0.016 0.5 0.003 Moderate 88 PM10
Jung-gu 68 38 0.031 0.022 0.4 0.003 Moderate 87 PM10
Yongsan-gu 60 37 0.016 0.021 0.3 0.003 Moderate 83 PM10
Seongdong-gu 75 45 0.019 0.025 0.4 0.004 Unhealthy 104 PM10
Gwangjin-gu 46 26 0.051 0.013 0.3 0.004 Moderate 86 PM10
Dongdaemun-gu 66 29 0.034 0.013 0.3 0.005 Moderate 85 PM10
Jungnang-gu 44 16 0.043 0.01 0.3 0.005 Moderate 86 PM10
Seongbuk-gu 43 20 0.041 0.012 0.5 0.003 Moderate 84 PM10
Gangbuk-gu 34 18 0.045 0.01 0.5 0.003 Moderate 67 PM10
Dobong-gu 45 19 0.048 0.006 0.3 0.005 Moderate 81 PM10
Nowon-gu 46 22 0.05 0.01 0.4 0.003 Moderate 79 PM10
Eunpyung-gu 77 38 0.036 0.017 0.6 0.003 Unhealthy 110 PM10
Seodaemun-gu 72 36 0.021 0.029 0.5 0.004 Moderate 98 PM10
Mapo-gu 67 40 0.033 0.016 0.5 0.003 Moderate 91 PM10
Yangcheon-gu 53 37 0.023 0.019 0.5 0.005 Moderate 87 PM25
Gangseo-gu 66 34 0.037 0.019 0.3 0.006 Moderate 94 PM10
Guro-gu 64 29 0.03 0.014 0.5 0.006 Moderate 94 PM10
Geumcheon-gu 60 43 0.03 0.025 0.5 0.005 Moderate 87 PM25
Yeongdeungpo-gu 61 23 0.035 0.021 0.6 0.004 Moderate 93 PM10
Dongjak-gu 60 34 0.035 0.022 0.4 0.003 Moderate 88 PM10
Gwanak-gu 62 35 0.037 0.02 0.4 0.003 Moderate 94 PM10
Seocho-gu 74 33 0.038 0.018 0.5 0.004 Unhealthy 104 PM10
Gangnam-gu 63 37 0.028 0.018 0.4 0.004 Moderate 85 PM10
Songpa-gu 62 32 0.032 0.021 0.5 0.004 Moderate 95 PM10
Gangdong-gu 45 20 0.048 0.009 0.3 0.003 Moderate 93 PM10