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 85 63 0.053 0.03 0.574 0.006 - 149.522 -
Jongno-gu 81 68 0.051 0.036 0.7 0.006 Unhealthy 190 PM25
Jung-gu 80 60 0.05 0.039 0.6 0.006 Unhealthy 181 PM25
Yongsan-gu 74 55 0.041 0.033 0.4 0.005 Unhealthy 116 PM25
Seongdong-gu 86 66 0.044 0.03 0.5 0.005 Unhealthy 166 PM25
Gwangjin-gu 79 72 0.065 0.027 0.6 0.006 Unhealthy 205 PM25
Dongdaemun-gu 78 44 0.047 0.03 0.5 0.006 Moderate 95 PM10
Jungnang-gu Being Evaluated Being Evaluated Being Evaluated Being Evaluated Being Evaluated Being Evaluated - Being Evaluated Being Evaluated
Seongbuk-gu 79 64 0.05 0.034 0.6 0.005 Unhealthy 122 PM25
Gangbuk-gu 78 57 0.063 0.023 0.5 0.005 Unhealthy 113 PM25
Dobong-gu 66 58 0.06 0.022 0.5 0.006 Unhealthy 107 PM25
Nowon-gu 92 Being Evaluated 0.082 0.021 Being Evaluated Being Evaluated - Being Evaluated Being Evaluated
Eunpyung-gu 87 66 0.052 0.026 0.6 0.006 Unhealthy 178 PM25
Seodaemun-gu 90 68 0.046 0.025 0.5 0.009 Unhealthy 160 PM25
Mapo-gu 89 86 0.051 0.038 0.6 0.007 Unhealthy 233 PM25
Yangcheon-gu 78 66 0.045 0.03 0.6 0.006 Unhealthy 190 PM25
Gangseo-gu 96 61 0.049 0.049 0.7 0.012 Unhealthy 101 PM25
Guro-gu 82 57 0.044 0.019 0.6 0.008 Unhealthy 160 PM25
Geumcheon-gu 80 66 0.051 0.039 0.6 0.006 Unhealthy 134 PM25
Yeongdeungpo-gu 96 59 0.05 0.036 0.7 0.007 Unhealthy 167 PM10
Dongjak-gu 79 60 0.067 0.027 0.6 0.006 Unhealthy 110 PM25
Gwanak-gu 75 51 0.063 0.027 0.5 0.005 Moderate 95 PM25
Seocho-gu 85 72 0.057 0.024 0.6 0.006 Unhealthy 175 PM25
Gangnam-gu 89 56 0.045 0.03 0.5 0.006 Unhealthy 175 PM25
Songpa-gu 108 67 0.059 0.029 0.7 0.006 Moderate 100 PM10
Gangdong-gu 102 72 0.05 0.032 0.5 0.005 Unhealthy 166 PM25