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Air quality · Jiangsu, China

Nanjing Air Quality Index (AQI) today

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

144 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 168.

Over the next 24 hours the model expects the AQI to range from 77 around 06:00 to 154 around 19:00 (4 Nov).

112th most polluted of 849 cities worldwide right now, 14th 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 · 249 22:00 · 249 23:00 · 238 00:00 · 217 01:00 · 197 02:00 · 186 03:00 · 178 04:00 · 172 05:00 · 167 06:00 · 165 07:00 · 164 08:00 · 166 09:00 · 166 10:00 · 162 11:00 · 157 12:00 · 153 13:00 · 146 14:00 · 140 15:00 · 135 16:00 · 135 17:00 · 137 18:00 · 140 19:00 · 142 20:00 · 144 21:00 · 146 22:00 · 145 23:00 · 144 00:00 · 141 01:00 · 129 02:00 · 107 03:00 · 92 04:00 · 85 05:00 · 80 06:00 · 77 07:00 · 78 08:00 · 79 09:00 · 80 10:00 · 80 11:00 · 80 12:00 · 79 13:00 · 79 14:00 · 80 15:00 · 81 16:00 · 87 17:00 · 112 18:00 · 147 19:00 · 154 20:00 · 153 21:00 · 135 22:00 · 115 23:00 · 99 00:00 · 92 01:00 · 90 02:00 · 89 03:00 · 91 04:00 · 94 05:00 · 98 06:00 · 107 07:00 · 122 08:00 · 131 09:00 · 139 10:00 · 140 11:00 · 136 12:00 · 129 13:00 · 121 14:00 · 114 15:00 · 111 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 21:00249
Mon 22:00249
Mon 23:00238
Tue 00:00217
Tue 01:00197
Tue 02:00186
Tue 03:00178
Tue 04:00172
Tue 05:00167
Tue 06:00165
Tue 07:00164
Tue 08:00166
Tue 09:00166
Tue 10:00162
Tue 11:00157
Tue 12:00153
Tue 13:00146
Tue 14:00140
Tue 15:00135
Tue 16:00135
Tue 17:00137
Tue 18:00140
Tue 19:00142
Tue 20:00 · Now144
Tue 21:00 · Forecast146
Tue 22:00 · Forecast145
Tue 23:00 · Forecast144
Wed 00:00 · Forecast141
Wed 01:00 · Forecast129
Wed 02:00 · Forecast107
Wed 03:00 · Forecast92
Wed 04:00 · Forecast85
Wed 05:00 · Forecast80
Wed 06:00 · Forecast77
Wed 07:00 · Forecast78
Wed 08:00 · Forecast79
Wed 09:00 · Forecast80
Wed 10:00 · Forecast80
Wed 11:00 · Forecast80
Wed 12:00 · Forecast79
Wed 13:00 · Forecast79
Wed 14:00 · Forecast80
Wed 15:00 · Forecast81
Wed 16:00 · Forecast87
Wed 17:00 · Forecast112
Wed 18:00 · Forecast147
Wed 19:00 · Forecast154
Wed 20:00 · Forecast153
Wed 21:00 · Forecast135
Wed 22:00 · Forecast115
Wed 23:00 · Forecast99
Thu 00:00 · Forecast92
Thu 01:00 · Forecast90
Thu 02:00 · Forecast89
Thu 03:00 · Forecast91
Thu 04:00 · Forecast94
Thu 05:00 · Forecast98
Thu 06:00 · Forecast107
Thu 07:00 · Forecast122
Thu 08:00 · Forecast131
Thu 09:00 · Forecast139
Thu 10:00 · Forecast140
Thu 11:00 · Forecast136
Thu 12:00 · Forecast129
Thu 13:00 · Forecast121
Thu 14:00 · Forecast114
Thu 15:00 · Forecast111

Pollutants this hour

  • PM2.5 54.2 µg/m³ 24-hour mean 80.4 µg/m³ · 5.4× WHO’s 24-hour guideline (15) 144
  • PM10 63 µg/m³ 54
  • O₃ 1 µg/m³ 2
  • NO₂ 80 µg/m³ 40
  • SO₂ 21 µg/m³ 11
  • CO 0.83 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
Hefei Anhui 145
Suzhou Jiangsu 141
Hangzhou Zhejiang 158
Shanghai Shanghai 149
Wuhan Hubei 146
Qingdao Shandong 110
Weifang Shandong 155

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 Nanjing’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 Nanjing right now?
144 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 Nanjing 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 Nanjing get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 77 around 06:00 to 154 around 19:00 (4 Nov). Forecasts beyond a day are less certain.

How does Nanjing compare with other cities?
Right now it is the 112th most polluted of 849 cities we track worldwide, and 14th of 25 in China, all on the same US EPA scale.

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