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Air quality · Sichuan, China

Chengdu Air Quality Index (AQI) today

Modelled estimate for 21:00 local time (UTC+8), refreshed 3 Nov, 07:52 UTC+0.

155 Unhealthy

Live estimate · modelled

US EPA AQI21:00 UTC+8, 3 Nov Main pollutant: PM2.5

Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects.

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 135.

Over the next 24 hours the model expects the AQI to range from 85 around 15:00 to 166 around 09:00 (4 Nov).

89th most polluted of 849 cities worldwide right now, 7th of 25 in China.

What to do today

  • Long walk or run outside Shorten it, take breaks
  • Kids playing outside Limit it
  • Airing the house Open briefly
  • Mask outdoors N95 if outside for long

Based on the US EPA’s health statement: “Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects.” General guidance, not medical advice.

Last 24 hours and next 48

Past hours Forecast

22:00 · 141 23:00 · 154 00:00 · 156 01:00 · 155 02:00 · 153 03:00 · 152 04:00 · 149 05:00 · 146 06:00 · 147 07:00 · 143 08:00 · 146 09:00 · 143 10:00 · 132 11:00 · 121 12:00 · 118 13:00 · 114 14:00 · 108 15:00 · 103 16:00 · 101 17:00 · 99 18:00 · 102 19:00 · 117 20:00 · 139 21:00 · 155 22:00 · 158 23:00 · 162 00:00 · 163 01:00 · 163 02:00 · 163 03:00 · 162 04:00 · 161 05:00 · 161 06:00 · 162 07:00 · 163 08:00 · 165 09:00 · 166 10:00 · 161 11:00 · 142 12:00 · 113 13:00 · 95 14:00 · 87 15:00 · 85 16:00 · 85 17:00 · 88 18:00 · 101 19:00 · 133 20:00 · 156 21:00 · 164 22:00 · 171 23:00 · 176 00:00 · 176 01:00 · 176 02:00 · 174 03:00 · 172 04:00 · 170 05:00 · 168 06:00 · 168 07:00 · 169 08:00 · 171 09:00 · 173 10:00 · 166 11:00 · 153 12:00 · 130 13:00 · 114 14:00 · 105 15:00 · 102 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 22:00141
Mon 23:00154
Tue 00:00156
Tue 01:00155
Tue 02:00153
Tue 03:00152
Tue 04:00149
Tue 05:00146
Tue 06:00147
Tue 07:00143
Tue 08:00146
Tue 09:00143
Tue 10:00132
Tue 11:00121
Tue 12:00118
Tue 13:00114
Tue 14:00108
Tue 15:00103
Tue 16:00101
Tue 17:0099
Tue 18:00102
Tue 19:00117
Tue 20:00139
Tue 21:00 · Now155
Tue 22:00 · Forecast158
Tue 23:00 · Forecast162
Wed 00:00 · Forecast163
Wed 01:00 · Forecast163
Wed 02:00 · Forecast163
Wed 03:00 · Forecast162
Wed 04:00 · Forecast161
Wed 05:00 · Forecast161
Wed 06:00 · Forecast162
Wed 07:00 · Forecast163
Wed 08:00 · Forecast165
Wed 09:00 · Forecast166
Wed 10:00 · Forecast161
Wed 11:00 · Forecast142
Wed 12:00 · Forecast113
Wed 13:00 · Forecast95
Wed 14:00 · Forecast87
Wed 15:00 · Forecast85
Wed 16:00 · Forecast85
Wed 17:00 · Forecast88
Wed 18:00 · Forecast101
Wed 19:00 · Forecast133
Wed 20:00 · Forecast156
Wed 21:00 · Forecast164
Wed 22:00 · Forecast171
Wed 23:00 · Forecast176
Thu 00:00 · Forecast176
Thu 01:00 · Forecast176
Thu 02:00 · Forecast174
Thu 03:00 · Forecast172
Thu 04:00 · Forecast170
Thu 05:00 · Forecast168
Thu 06:00 · Forecast168
Thu 07:00 · Forecast169
Thu 08:00 · Forecast171
Thu 09:00 · Forecast173
Thu 10:00 · Forecast166
Thu 11:00 · Forecast153
Thu 12:00 · Forecast130
Thu 13:00 · Forecast114
Thu 14:00 · Forecast105
Thu 15:00 · Forecast102

Pollutants this hour

  • PM2.5 70.1 µg/m³ 24-hour mean 49.5 µg/m³ · 3.3× WHO’s 24-hour guideline (15) 155
  • PM10 74 µg/m³ 56
  • O₃ 37 µg/m³ 32
  • NO₂ 61 µg/m³ 30
  • SO₂ 7 µg/m³ 3
  • CO 2.13 mg/m³ 10

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
Chongqing Chongqing 173
Xi’an Shaanxi 225
Kunming Yunnan 54
Wuzhong Ningxia 83
Nanning Guangxi 72
Wuhan Hubei 148
Zhengzhou Henan 107

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 Chengdu’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 Chengdu right now?
155 on the US EPA scale (Unhealthy) at 21:00 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 Chengdu today?
Consider shortening outdoor exercise; sensitive groups should move it indoors. The EPA’s statement for “Unhealthy”: Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. General guidance, not medical advice.

Will the air in Chengdu get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 85 around 15:00 to 166 around 09:00 (4 Nov). Forecasts beyond a day are less certain.

How does Chengdu compare with other cities?
Right now it is the 89th most polluted of 849 cities we track worldwide, and 7th of 25 in China, all on the same US EPA scale.

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