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Air quality · Anhui, China

Hefei Air Quality Index (AQI) today

Modelled estimate for 20:00 local time (UTC+8), refreshed 3 Nov, 07:52 UTC+0.

145 Unhealthy for sensitive groups

Live estimate · modelled

US EPA AQI20:00 UTC+8, 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 163.

Over the next 24 hours the model expects the AQI to range from 60 around 16:00 to 140 around 21:00 (3 Nov).

108th most polluted of 849 cities worldwide right now, 13th of 25 in China.

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

21:00 · 185 22:00 · 185 23:00 · 182 00:00 · 179 01:00 · 176 02:00 · 174 03:00 · 173 04:00 · 172 05:00 · 171 06:00 · 169 07:00 · 169 08:00 · 168 09:00 · 167 10:00 · 166 11:00 · 164 12:00 · 160 13:00 · 157 14:00 · 155 15:00 · 154 16:00 · 152 17:00 · 151 18:00 · 149 19:00 · 147 20:00 · 145 21:00 · 140 22:00 · 135 23:00 · 124 00:00 · 105 01:00 · 92 02:00 · 83 03:00 · 77 04:00 · 72 05:00 · 69 06:00 · 68 07:00 · 72 08:00 · 75 09:00 · 75 10:00 · 74 11:00 · 72 12:00 · 71 13:00 · 70 14:00 · 67 15:00 · 62 16:00 · 60 17:00 · 62 18:00 · 67 19:00 · 73 20:00 · 81 21:00 · 89 22:00 · 97 23:00 · 106 00:00 · 112 01:00 · 118 02:00 · 125 03:00 · 132 04:00 · 140 05:00 · 149 06:00 · 153 07:00 · 156 08:00 · 159 09:00 · 159 10:00 · 158 11:00 · 155 12:00 · 150 13:00 · 131 14:00 · 116 15:00 · 107 Now

US EPA AQI per hour, UTC+8. 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 21:00185
Mon 22:00185
Mon 23:00182
Tue 00:00179
Tue 01:00176
Tue 02:00174
Tue 03:00173
Tue 04:00172
Tue 05:00171
Tue 06:00169
Tue 07:00169
Tue 08:00168
Tue 09:00167
Tue 10:00166
Tue 11:00164
Tue 12:00160
Tue 13:00157
Tue 14:00155
Tue 15:00154
Tue 16:00152
Tue 17:00151
Tue 18:00149
Tue 19:00147
Tue 20:00 · Now145
Tue 21:00 · Forecast140
Tue 22:00 · Forecast135
Tue 23:00 · Forecast124
Wed 00:00 · Forecast105
Wed 01:00 · Forecast92
Wed 02:00 · Forecast83
Wed 03:00 · Forecast77
Wed 04:00 · Forecast72
Wed 05:00 · Forecast69
Wed 06:00 · Forecast68
Wed 07:00 · Forecast72
Wed 08:00 · Forecast75
Wed 09:00 · Forecast75
Wed 10:00 · Forecast74
Wed 11:00 · Forecast72
Wed 12:00 · Forecast71
Wed 13:00 · Forecast70
Wed 14:00 · Forecast67
Wed 15:00 · Forecast62
Wed 16:00 · Forecast60
Wed 17:00 · Forecast62
Wed 18:00 · Forecast67
Wed 19:00 · Forecast73
Wed 20:00 · Forecast81
Wed 21:00 · Forecast89
Wed 22:00 · Forecast97
Wed 23:00 · Forecast106
Thu 00:00 · Forecast112
Thu 01:00 · Forecast118
Thu 02:00 · Forecast125
Thu 03:00 · Forecast132
Thu 04:00 · Forecast140
Thu 05:00 · Forecast149
Thu 06:00 · Forecast153
Thu 07:00 · Forecast156
Thu 08:00 · Forecast159
Thu 09:00 · Forecast159
Thu 10:00 · Forecast158
Thu 11:00 · Forecast155
Thu 12:00 · Forecast150
Thu 13:00 · Forecast131
Thu 14:00 · Forecast116
Thu 15:00 · Forecast107

Pollutants this hour

  • PM2.5 51.6 µg/m³ 24-hour mean 73.0 µg/m³ · 4.9× WHO’s 24-hour guideline (15) 145
  • PM10 60 µg/m³ 55
  • O₃ 0 µg/m³ 3
  • NO₂ 67 µg/m³ 33
  • SO₂ 19 µg/m³ 10
  • CO 0.76 mg/m³ 6

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
Nanjing Jiangsu 144
Wuhan Hubei 146
Suzhou Jiangsu 141
Hangzhou Zhejiang 158
Shanghai Shanghai 149
Zhengzhou Henan 106
Jinan Shandong 159

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 Hefei’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 Hefei right now?
145 on the US EPA scale (Unhealthy for sensitive groups) at 20:00 UTC+8, 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 Hefei 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 Hefei get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 60 around 16:00 to 140 around 21:00 (3 Nov). Forecasts beyond a day are less certain.

How does Hefei compare with other cities?
Right now it is the 108th most polluted of 849 cities we track worldwide, and 13th of 25 in China, all on the same US EPA scale.

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