Air Quality Information

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Data base date : February 8, 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 Over 0.12ppm Under 0.12ppm
Warning Over 0.30ppm Between 0.12 and 0.30ppm → Change alert level to advisory
Serious Warning Over 0.50ppm Between 0.30 and 0.50ppm → Change alert level to warning
Coarse Particles Advisory Hourly average of 200㎍/㎥ or higher for 2 hours or more, or moving average of 120㎍/㎥ or higher for over 24 hours Hourly average is under 150㎍/㎥ or moving average for over 24 hours is under 100㎍/㎥
Warning Hourly average of 400㎍/㎥ or higher for 2 hours or more, or moving average of 250㎍/㎥ or higher for over 24 hours Hourly average is between 200-400㎍/㎥ or moving average for over 24 hours is between 120-250㎍/㎥; Change alert level to advisory
Fine particles Preliminary Advisory Stage Hourly average of 100㎍/㎥ or higher for 2 hours or more Hourly average is under 80㎍/㎥
Advisory Hourly average of 120㎍/㎥ or higher for 2 hours or more, or moving average of 65㎍/㎥ or higher for over 24 hours Hourly average is under 100㎍/㎥ or moving average for over 24 hours is under 50㎍/㎥
Warning Hourly average of 250㎍/㎥ or higher for 2 hours or more, or moving average of 150㎍/㎥ or higher for over 24 hours Hourly average is between 120-250㎍/㎥, or moving average for over 24 hours is between 65-150㎍/㎥

◆ 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 22 17 0.033 0.014 0.372 0.003 - 55.261 -
Jongno-gu 19 11 0.026 0.014 0.4 0.002 Good 46 PM25
Jung-gu 16 13 0.037 0.015 0.3 0.002 Moderate 56 O3
Yongsan-gu 21 19 0.027 0.026 0.4 0.002 Moderate 52 PM25
Seongdong-gu 29 21 0.034 0.020 0.4 0.002 Moderate 61 PM25
Gwangjin-gu 20 20 0.024 0.016 0.6 0.003 - Being Evaluated Being Evaluated
Dongdaemun-gu 17 13 0.026 0.014 0.4 0.004 Good 46 PM25
Jungnang-gu 16 14 0.027 0.014 0.3 0.004 Moderate 51 PM25
Seongbuk-gu 23 18 0.030 0.014 0.6 0.002 Moderate 51 O3
Gangbuk-gu 23 12 0.035 0.006 0.3 0.002 Moderate 55 O3
Dobong-gu 28 16 0.046 0.004 0.3 0.003 Moderate 64 O3
Nowon-gu 21 16 0.025 0.015 0.4 0.004 Moderate 51 PM25
Eunpyung-gu 23 21 0.034 0.014 0.3 0.004 Moderate 55 PM25
Seodaemun-gu Being Evaluated 23 0.035 0.008 0.6 0.002 - Being Evaluated Being Evaluated
Mapo-gu 32 26 0.037 0.010 0.4 0.003 Moderate 63 PM25
Yangcheon-gu 22 14 0.030 0.012 0.4 0.003 Moderate 51 O3
Gangseo-gu 19 16 0.040 0.011 0.3 0.003 Moderate 59 O3
Guro-gu 14 16 0.043 0.010 0.2 0.004 Moderate 61 O3
Geumcheon-gu 19 14 0.025 0.019 0.4 0.002 Good 49 PM25
Yeongdeungpo-gu 30 26 0.037 0.016 0.3 0.003 Moderate 63 PM25
Dongjak-gu 23 15 0.032 0.015 0.3 0.002 Moderate 53 PM25
Gwanak-gu 29 20 0.044 0.013 0.2 0.003 Moderate 63 PM25
Seocho-gu 16 14 0.045 0.009 0.3 0.004 Moderate 63 O3
Gangnam-gu 16 14 0.029 0.011 0.4 0.005 Good 49 O3
Songpa-gu 32 19 0.034 0.018 0.4 0.002 Moderate 56 PM25
Gangdong-gu 23 16 0.024 0.016 0.4 0.003 Moderate 53 PM25