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Air quality · North Chungcheong, South Korea

Cheongju-si Air Quality Index (AQI) today

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

109 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 94.

Over the next 24 hours the model expects the AQI to range from 93 around 17:00 to 135 around 08:00 (4 Nov).

169th most polluted of 849 cities worldwide right now, 11th 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 · 82 23:00 · 83 00:00 · 85 01:00 · 88 02:00 · 89 03:00 · 91 04:00 · 92 05:00 · 93 06:00 · 94 07:00 · 97 08:00 · 106 09:00 · 101 10:00 · 92 11:00 · 86 12:00 · 83 13:00 · 82 14:00 · 84 15:00 · 88 16:00 · 90 17:00 · 93 18:00 · 98 19:00 · 104 20:00 · 107 21:00 · 109 22:00 · 111 23:00 · 114 00:00 · 116 01:00 · 117 02:00 · 118 03:00 · 121 04:00 · 123 05:00 · 122 06:00 · 123 07:00 · 127 08:00 · 135 09:00 · 135 10:00 · 133 11:00 · 132 12:00 · 130 13:00 · 122 14:00 · 111 15:00 · 101 16:00 · 95 17:00 · 93 18:00 · 94 19:00 · 95 20:00 · 95 21:00 · 96 22:00 · 96 23:00 · 97 00:00 · 97 01:00 · 95 02:00 · 94 03:00 · 91 04:00 · 86 05:00 · 83 06:00 · 79 07:00 · 77 08:00 · 75 09:00 · 74 10:00 · 71 11:00 · 67 12:00 · 64 13:00 · 61 14:00 · 59 15:00 · 57 16:00 · 55 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 22:0082
Mon 23:0083
Tue 00:0085
Tue 01:0088
Tue 02:0089
Tue 03:0091
Tue 04:0092
Tue 05:0093
Tue 06:0094
Tue 07:0097
Tue 08:00106
Tue 09:00101
Tue 10:0092
Tue 11:0086
Tue 12:0083
Tue 13:0082
Tue 14:0084
Tue 15:0088
Tue 16:0090
Tue 17:0093
Tue 18:0098
Tue 19:00104
Tue 20:00107
Tue 21:00 · Now109
Tue 22:00 · Forecast111
Tue 23:00 · Forecast114
Wed 00:00 · Forecast116
Wed 01:00 · Forecast117
Wed 02:00 · Forecast118
Wed 03:00 · Forecast121
Wed 04:00 · Forecast123
Wed 05:00 · Forecast122
Wed 06:00 · Forecast123
Wed 07:00 · Forecast127
Wed 08:00 · Forecast135
Wed 09:00 · Forecast135
Wed 10:00 · Forecast133
Wed 11:00 · Forecast132
Wed 12:00 · Forecast130
Wed 13:00 · Forecast122
Wed 14:00 · Forecast111
Wed 15:00 · Forecast101
Wed 16:00 · Forecast95
Wed 17:00 · Forecast93
Wed 18:00 · Forecast94
Wed 19:00 · Forecast95
Wed 20:00 · Forecast95
Wed 21:00 · Forecast96
Wed 22:00 · Forecast96
Wed 23:00 · Forecast97
Thu 00:00 · Forecast97
Thu 01:00 · Forecast95
Thu 02:00 · Forecast94
Thu 03:00 · Forecast91
Thu 04:00 · Forecast86
Thu 05:00 · Forecast83
Thu 06:00 · Forecast79
Thu 07:00 · Forecast77
Thu 08:00 · Forecast75
Thu 09:00 · Forecast74
Thu 10:00 · Forecast71
Thu 11:00 · Forecast67
Thu 12:00 · Forecast64
Thu 13:00 · Forecast61
Thu 14:00 · Forecast59
Thu 15:00 · Forecast57
Thu 16:00 · Forecast55

Pollutants this hour

  • PM2.5 39.8 µg/m³ 24-hour mean 32.1 µg/m³ · 2.1× WHO’s 24-hour guideline (15) 109
  • PM10 63 µg/m³ 54
  • O₃ 0 µg/m³ 11
  • NO₂ 72 µg/m³ 36
  • SO₂ 16 µg/m³ 9
  • CO 0.52 mg/m³ 3

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
Daejeon Daejeon 112
Cheonan Chungcheongnam-do 107
Suwon Gyeonggi-do 147
Jeonju Jeollabuk-do 123
Seoul Seoul 168
Incheon Incheon 168
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 Cheongju-si’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 Cheongju-si right now?
109 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 Cheongju-si 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 Cheongju-si get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 93 around 17:00 to 135 around 08:00 (4 Nov). Forecasts beyond a day are less certain.

How does Cheongju-si compare with other cities?
Right now it is the 169th most polluted of 849 cities we track worldwide, and 11th of 12 in South Korea, all on the same US EPA scale.

Why does another app show a different AQI for Cheongju-si?
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.