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Air quality · Gyeonggi-do, South Korea

Suwon Air Quality Index (AQI) today

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

147 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 119.

Over the next 24 hours the model expects the AQI to range from 111 around 16:00 to 144 around 22:00 (3 Nov).

105th most polluted of 849 cities worldwide right now, 4th 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 · 103 23:00 · 111 00:00 · 120 01:00 · 123 02:00 · 124 03:00 · 123 04:00 · 121 05:00 · 118 06:00 · 116 07:00 · 116 08:00 · 117 09:00 · 117 10:00 · 108 11:00 · 102 12:00 · 98 13:00 · 97 14:00 · 99 15:00 · 102 16:00 · 107 17:00 · 114 18:00 · 132 19:00 · 143 20:00 · 148 21:00 · 147 22:00 · 144 23:00 · 141 00:00 · 137 01:00 · 134 02:00 · 131 03:00 · 130 04:00 · 128 05:00 · 126 06:00 · 125 07:00 · 127 08:00 · 131 09:00 · 133 10:00 · 133 11:00 · 132 12:00 · 133 13:00 · 131 14:00 · 125 15:00 · 117 16:00 · 111 17:00 · 113 18:00 · 122 19:00 · 132 20:00 · 137 21:00 · 138 22:00 · 137 23:00 · 134 00:00 · 126 01:00 · 118 02:00 · 108 03:00 · 98 04:00 · 93 05:00 · 91 06:00 · 90 07:00 · 90 08:00 · 93 09:00 · 95 10:00 · 95 11:00 · 90 12:00 · 86 13:00 · 80 14:00 · 73 15:00 · 68 16:00 · 63 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 22:00103
Mon 23:00111
Tue 00:00120
Tue 01:00123
Tue 02:00124
Tue 03:00123
Tue 04:00121
Tue 05:00118
Tue 06:00116
Tue 07:00116
Tue 08:00117
Tue 09:00117
Tue 10:00108
Tue 11:00102
Tue 12:0098
Tue 13:0097
Tue 14:0099
Tue 15:00102
Tue 16:00107
Tue 17:00114
Tue 18:00132
Tue 19:00143
Tue 20:00148
Tue 21:00 · Now147
Tue 22:00 · Forecast144
Tue 23:00 · Forecast141
Wed 00:00 · Forecast137
Wed 01:00 · Forecast134
Wed 02:00 · Forecast131
Wed 03:00 · Forecast130
Wed 04:00 · Forecast128
Wed 05:00 · Forecast126
Wed 06:00 · Forecast125
Wed 07:00 · Forecast127
Wed 08:00 · Forecast131
Wed 09:00 · Forecast133
Wed 10:00 · Forecast133
Wed 11:00 · Forecast132
Wed 12:00 · Forecast133
Wed 13:00 · Forecast131
Wed 14:00 · Forecast125
Wed 15:00 · Forecast117
Wed 16:00 · Forecast111
Wed 17:00 · Forecast113
Wed 18:00 · Forecast122
Wed 19:00 · Forecast132
Wed 20:00 · Forecast137
Wed 21:00 · Forecast138
Wed 22:00 · Forecast137
Wed 23:00 · Forecast134
Thu 00:00 · Forecast126
Thu 01:00 · Forecast118
Thu 02:00 · Forecast108
Thu 03:00 · Forecast98
Thu 04:00 · Forecast93
Thu 05:00 · Forecast91
Thu 06:00 · Forecast90
Thu 07:00 · Forecast90
Thu 08:00 · Forecast93
Thu 09:00 · Forecast95
Thu 10:00 · Forecast95
Thu 11:00 · Forecast90
Thu 12:00 · Forecast86
Thu 13:00 · Forecast80
Thu 14:00 · Forecast73
Thu 15:00 · Forecast68
Thu 16:00 · Forecast63

Pollutants this hour

  • PM2.5 53.7 µg/m³ 24-hour mean 42.8 µg/m³ · 2.9× WHO’s 24-hour guideline (15) 147
  • PM10 77 µg/m³ 63
  • O₃ 0 µg/m³ 11
  • NO₂ 75 µg/m³ 37
  • SO₂ 33 µg/m³ 17
  • CO 0.60 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
Seoul Seoul 168
Incheon Incheon 168
Cheonan Chungcheongnam-do 107
Cheongju-si North Chungcheong 109
Daejeon Daejeon 112
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 Suwon’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 Suwon right now?
147 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 Suwon 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 Suwon get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 111 around 16:00 to 144 around 22:00 (3 Nov). Forecasts beyond a day are less certain.

How does Suwon compare with other cities?
Right now it is the 105th most polluted of 849 cities we track worldwide, and 4th of 12 in South Korea, all on the same US EPA scale.

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