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 126 95 0.003 0.058 1.012 0.006 - 252.68 -
Jongno-gu 115 91 0.002 0.060 1.2 0.007 Unhealthy 214 PM25
Jung-gu 115 88 0.002 0.061 1.1 0.006 Unhealthy 233 PM25
Yongsan-gu 135 122 0.002 0.057 0.7 0.006 - 263 PM25
Seongdong-gu 129 93 0.002 0.054 0.8 0.008 - 260 PM25
Gwangjin-gu 136 94 0.003 0.063 1.1 0.004 Unhealthy 242 PM25
Dongdaemun-gu 151 87 0.002 0.065 0.7 0.007 - 269 PM10
Jungnang-gu 129 99 0.006 0.050 0.8 0.005 - 254 PM25
Seongbuk-gu 154 127 0.003 0.053 0.9 0.007 - 275 PM25
Gangbuk-gu 102 68 0.003 0.053 0.9 0.007 Unhealthy 201 PM10
Dobong-gu 162 91 0.007 0.052 1.0 0.006 - 255 PM10
Nowon-gu 126 89 0.002 0.062 1.1 0.008 - 252 PM25
Eunpyung-gu 128 88 0.004 0.075 1.2 0.004 - 255 PM25
Seodaemun-gu 135 103 0.003 0.065 1.3 0.004 - 261 PM10
Mapo-gu 127 95 0.002 0.066 1.4 0.006 - 264 PM25
Yangcheon-gu 95 82 0.001 0.048 1.0 0.005 Unhealthy 239 PM25
Gangseo-gu 97 76 0.002 0.049 0.9 0.004 - 260 PM25
Guro-gu 122 86 0.002 0.040 0.4 0.007 Unhealthy 236 PM25
Geumcheon-gu 113 90 0.002 0.071 1.3 0.006 - 261 PM25
Yeongdeungpo-gu 112 85 0.005 0.044 0.7 0.007 Unhealthy 242 PM25
Dongjak-gu 125 116 0.004 0.074 1.2 0.006 - 300 PM25
Gwanak-gu 117 112 0.003 0.071 1.3 0.007 - 285 PM25
Seocho-gu 153 115 0.003 0.054 1.1 0.006 - 254 PM25
Gangnam-gu 111 98 0.002 0.061 1.0 0.007 - 252 PM25
Songpa-gu 129 89 0.003 0.057 1.2 0.006 Unhealthy 227 PM25
Gangdong-gu 135 99 0.003 0.054 1.0 0.005 - 263 PM25