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Air quality · Gyeongsangnam-do, South Korea

Changwon Air Quality Index (AQI) today

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

129 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 81.

Over the next 24 hours the model expects the AQI to range from 74 around 16:00 to 144 around 00:00 (4 Nov).

135th most polluted of 849 cities worldwide right now, 6th 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 · 72 23:00 · 72 00:00 · 72 01:00 · 72 02:00 · 72 03:00 · 71 04:00 · 71 05:00 · 71 06:00 · 70 07:00 · 71 08:00 · 71 09:00 · 71 10:00 · 69 11:00 · 68 12:00 · 70 13:00 · 74 14:00 · 77 15:00 · 79 16:00 · 80 17:00 · 85 18:00 · 94 19:00 · 107 20:00 · 119 21:00 · 129 22:00 · 136 23:00 · 142 00:00 · 144 01:00 · 141 02:00 · 134 03:00 · 126 04:00 · 119 05:00 · 116 06:00 · 109 07:00 · 106 08:00 · 105 09:00 · 104 10:00 · 103 11:00 · 102 12:00 · 96 13:00 · 89 14:00 · 82 15:00 · 77 16:00 · 74 17:00 · 74 18:00 · 76 19:00 · 77 20:00 · 77 21:00 · 76 22:00 · 76 23:00 · 77 00:00 · 77 01:00 · 77 02:00 · 77 03:00 · 76 04:00 · 75 05:00 · 73 06:00 · 71 07:00 · 72 08:00 · 74 09:00 · 76 10:00 · 76 11:00 · 69 12:00 · 61 13:00 · 55 14:00 · 48 15:00 · 44 16:00 · 43 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 22:0072
Mon 23:0072
Tue 00:0072
Tue 01:0072
Tue 02:0072
Tue 03:0071
Tue 04:0071
Tue 05:0071
Tue 06:0070
Tue 07:0071
Tue 08:0071
Tue 09:0071
Tue 10:0069
Tue 11:0068
Tue 12:0070
Tue 13:0074
Tue 14:0077
Tue 15:0079
Tue 16:0080
Tue 17:0085
Tue 18:0094
Tue 19:00107
Tue 20:00119
Tue 21:00 · Now129
Tue 22:00 · Forecast136
Tue 23:00 · Forecast142
Wed 00:00 · Forecast144
Wed 01:00 · Forecast141
Wed 02:00 · Forecast134
Wed 03:00 · Forecast126
Wed 04:00 · Forecast119
Wed 05:00 · Forecast116
Wed 06:00 · Forecast109
Wed 07:00 · Forecast106
Wed 08:00 · Forecast105
Wed 09:00 · Forecast104
Wed 10:00 · Forecast103
Wed 11:00 · Forecast102
Wed 12:00 · Forecast96
Wed 13:00 · Forecast89
Wed 14:00 · Forecast82
Wed 15:00 · Forecast77
Wed 16:00 · Forecast74
Wed 17:00 · Forecast74
Wed 18:00 · Forecast76
Wed 19:00 · Forecast77
Wed 20:00 · Forecast77
Wed 21:00 · Forecast76
Wed 22:00 · Forecast76
Wed 23:00 · Forecast77
Thu 00:00 · Forecast77
Thu 01:00 · Forecast77
Thu 02:00 · Forecast77
Thu 03:00 · Forecast76
Thu 04:00 · Forecast75
Thu 05:00 · Forecast73
Thu 06:00 · Forecast71
Thu 07:00 · Forecast72
Thu 08:00 · Forecast74
Thu 09:00 · Forecast76
Thu 10:00 · Forecast76
Thu 11:00 · Forecast69
Thu 12:00 · Forecast61
Thu 13:00 · Forecast55
Thu 14:00 · Forecast48
Thu 15:00 · Forecast44
Thu 16:00 · Forecast43

Pollutants this hour

  • PM2.5 50.8 µg/m³ 24-hour mean 25.2 µg/m³ · 1.7× WHO’s 24-hour guideline (15) 129
  • PM10 70 µg/m³ 57
  • O₃ 15 µg/m³ 17
  • NO₂ 52 µg/m³ 25
  • SO₂ 39 µg/m³ 20
  • CO 0.46 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
Busan Busan 151
Ulsan Ulsan 120
Daegu Daegu 134
Jeonju Jeollabuk-do 123
Gwangju Gwangju 119
Daejeon Daejeon 112
Cheongju-si North Chungcheong 109

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 Changwon’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 Changwon right now?
129 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 Changwon 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 Changwon get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 74 around 16:00 to 144 around 00:00 (4 Nov). Forecasts beyond a day are less certain.

How does Changwon compare with other cities?
Right now it is the 135th most polluted of 849 cities we track worldwide, and 6th of 12 in South Korea, all on the same US EPA scale.

Why does another app show a different AQI for Changwon?
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.