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Air quality · Chungcheongnam-do, South Korea

Cheonan Air Quality Index (AQI) today

Modelled estimate for 21:00 local time (UTC+9), refreshed 3 Nov, 07:52 UTC+0.

107 Unhealthy for sensitive groups

Live estimate · modelled

US EPA AQI21:00 UTC+9, 3 Nov Main pollutant: PM2.5

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

This page uses EPA’s NowCast, which follows the last few hours, as the US government’s AirNow does. On a 24-hour average of particles, as many apps show, it is 100.

Over the next 24 hours the model expects the AQI to range from 100 around 17:00 to 132 around 09:00 (4 Nov).

179th most polluted of 849 cities worldwide right now, 12th of 12 in South Korea.

What to do today

  • Long walk or run outside Shorter if you have asthma or heart disease
  • Kids playing outside OK, less for kids with asthma
  • Airing the house Open
  • Mask outdoors If you are in a sensitive group

Based on the US EPA’s health statement: “Members of sensitive groups may experience health effects. The general public is less likely to be affected.” General guidance, not medical advice.

Last 24 hours and next 48

Past hours Forecast

22:00 · 90 23:00 · 92 00:00 · 93 01:00 · 95 02:00 · 96 03:00 · 99 04:00 · 102 05:00 · 103 06:00 · 104 07:00 · 106 08:00 · 112 09:00 · 109 10:00 · 101 11:00 · 94 12:00 · 90 13:00 · 89 14:00 · 89 15:00 · 92 16:00 · 95 17:00 · 98 18:00 · 105 19:00 · 109 20:00 · 108 21:00 · 107 22:00 · 106 23:00 · 105 00:00 · 105 01:00 · 105 02:00 · 106 03:00 · 108 04:00 · 110 05:00 · 112 06:00 · 115 07:00 · 120 08:00 · 129 09:00 · 132 10:00 · 129 11:00 · 127 12:00 · 127 13:00 · 123 14:00 · 117 15:00 · 108 16:00 · 101 17:00 · 100 18:00 · 104 19:00 · 107 20:00 · 108 21:00 · 109 22:00 · 110 23:00 · 110 00:00 · 108 01:00 · 105 02:00 · 102 03:00 · 96 04:00 · 93 05:00 · 89 06:00 · 84 07:00 · 81 08:00 · 80 09:00 · 80 10:00 · 78 11:00 · 75 12:00 · 71 13:00 · 69 14:00 · 67 15:00 · 63 16:00 · 61 Now

US EPA AQI per hour, UTC+9. Particles use EPA’s NowCast (a 12-hour weighted average), ozone and CO an 8-hour average. Lighter bars are the CAMS forecast.

Show as a table
TimeAQI
Mon 22:0090
Mon 23:0092
Tue 00:0093
Tue 01:0095
Tue 02:0096
Tue 03:0099
Tue 04:00102
Tue 05:00103
Tue 06:00104
Tue 07:00106
Tue 08:00112
Tue 09:00109
Tue 10:00101
Tue 11:0094
Tue 12:0090
Tue 13:0089
Tue 14:0089
Tue 15:0092
Tue 16:0095
Tue 17:0098
Tue 18:00105
Tue 19:00109
Tue 20:00108
Tue 21:00 · Now107
Tue 22:00 · Forecast106
Tue 23:00 · Forecast105
Wed 00:00 · Forecast105
Wed 01:00 · Forecast105
Wed 02:00 · Forecast106
Wed 03:00 · Forecast108
Wed 04:00 · Forecast110
Wed 05:00 · Forecast112
Wed 06:00 · Forecast115
Wed 07:00 · Forecast120
Wed 08:00 · Forecast129
Wed 09:00 · Forecast132
Wed 10:00 · Forecast129
Wed 11:00 · Forecast127
Wed 12:00 · Forecast127
Wed 13:00 · Forecast123
Wed 14:00 · Forecast117
Wed 15:00 · Forecast108
Wed 16:00 · Forecast101
Wed 17:00 · Forecast100
Wed 18:00 · Forecast104
Wed 19:00 · Forecast107
Wed 20:00 · Forecast108
Wed 21:00 · Forecast109
Wed 22:00 · Forecast110
Wed 23:00 · Forecast110
Thu 00:00 · Forecast108
Thu 01:00 · Forecast105
Thu 02:00 · Forecast102
Thu 03:00 · Forecast96
Thu 04:00 · Forecast93
Thu 05:00 · Forecast89
Thu 06:00 · Forecast84
Thu 07:00 · Forecast81
Thu 08:00 · Forecast80
Thu 09:00 · Forecast80
Thu 10:00 · Forecast78
Thu 11:00 · Forecast75
Thu 12:00 · Forecast71
Thu 13:00 · Forecast69
Thu 14:00 · Forecast67
Thu 15:00 · Forecast63
Thu 16:00 · Forecast61

Pollutants this hour

  • PM2.5 37.0 µg/m³ 24-hour mean 35.3 µg/m³ · 2.4× WHO’s 24-hour guideline (15) 107
  • PM10 58 µg/m³ 53
  • O₃ 0 µg/m³ 11
  • NO₂ 73 µg/m³ 36
  • SO₂ 13 µg/m³ 6
  • CO 0.36 mg/m³ 2

Modelled concentrations at the city’s location (CAMS). The sub-index uses the same averaging as the headline, so the highest one is the AQI.

Nearby cities

City AQI
Cheongju-si North Chungcheong 109
Daejeon Daejeon 112
Suwon Gyeonggi-do 147
Incheon Incheon 168
Seoul Seoul 168
Jeonju Jeollabuk-do 123
Daegu Daegu 134

Where this number comes from

The Copernicus Atmosphere Monitoring Service (CAMS) forecasts air pollution worldwide on a grid (about 11 km over Europe, about 45 km elsewhere). We take the grid value at Cheonan’s coordinates and score it with the US EPA’s method. It is a model, not a measurement: a nearby monitoring station can read quite differently, especially next to busy roads or during fires and dust storms.

Full methodology · Data: CAMS via Open-Meteo (CC BY 4.0); city list: GeoNames (CC BY 4.0).

  • Good 0–50
  • Moderate 51–100
  • Unhealthy for sensitive groups 101–150
  • Unhealthy 151–200
  • Very unhealthy 201–300
  • Hazardous 301–500

Questions

What is the AQI in Cheonan right now?
107 on the US EPA scale (Unhealthy for sensitive groups) at 21:00 UTC+9, 3 Nov. PM2.5 is the pollutant with the highest sub-index. This is a modelled estimate from the Copernicus Atmosphere Monitoring Service (CAMS), not a reading from a monitoring station.

Is it safe to exercise outside in Cheonan today?
For most people, yes; people with asthma, heart or lung disease, older adults and children should take it easier. The EPA’s statement for “Unhealthy for sensitive groups”: Members of sensitive groups may experience health effects. The general public is less likely to be affected. General guidance, not medical advice.

Will the air in Cheonan get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 100 around 17:00 to 132 around 09:00 (4 Nov). Forecasts beyond a day are less certain.

How does Cheonan compare with other cities?
Right now it is the 179th most polluted of 849 cities we track worldwide, and 12th of 12 in South Korea, all on the same US EPA scale.

Why does another app show a different AQI for Cheonan?
Apps differ in source (government stations, low-cost sensors or a model like this one), in scale (US EPA, European, or a national index) and in averaging (hourly or NowCast, 8-hour, 24-hour). This page uses the US EPA AQI with EPA’s NowCast for particles, computed from the CAMS forecast for the city’s location.