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Air quality · Taiwan, Taiwan

Taichung Air Quality Index (AQI) today

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

146 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 119.

Over the next 24 hours the model expects the AQI to range from 110 around 15:00 to 158 around 20:00 (4 Nov).

105th most polluted of 849 cities worldwide right now, 1st of 4 in Taiwan.

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 · 110 22:00 · 124 23:00 · 132 00:00 · 134 01:00 · 136 02:00 · 135 03:00 · 132 04:00 · 127 05:00 · 123 06:00 · 124 07:00 · 128 08:00 · 131 09:00 · 125 10:00 · 114 11:00 · 106 12:00 · 99 13:00 · 96 14:00 · 94 15:00 · 94 16:00 · 96 17:00 · 99 18:00 · 104 19:00 · 119 20:00 · 146 21:00 · 155 22:00 · 157 23:00 · 157 00:00 · 156 01:00 · 155 02:00 · 153 03:00 · 152 04:00 · 149 05:00 · 146 06:00 · 151 07:00 · 152 08:00 · 144 09:00 · 132 10:00 · 123 11:00 · 118 12:00 · 114 13:00 · 112 14:00 · 111 15:00 · 110 16:00 · 111 17:00 · 113 18:00 · 120 19:00 · 143 20:00 · 158 21:00 · 165 22:00 · 169 23:00 · 171 00:00 · 170 01:00 · 167 02:00 · 163 03:00 · 158 04:00 · 153 05:00 · 147 06:00 · 138 07:00 · 141 08:00 · 134 09:00 · 119 10:00 · 103 11:00 · 95 12:00 · 93 13:00 · 94 14:00 · 96 15:00 · 98 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 21:00110
Mon 22:00124
Mon 23:00132
Tue 00:00134
Tue 01:00136
Tue 02:00135
Tue 03:00132
Tue 04:00127
Tue 05:00123
Tue 06:00124
Tue 07:00128
Tue 08:00131
Tue 09:00125
Tue 10:00114
Tue 11:00106
Tue 12:0099
Tue 13:0096
Tue 14:0094
Tue 15:0094
Tue 16:0096
Tue 17:0099
Tue 18:00104
Tue 19:00119
Tue 20:00 · Now146
Tue 21:00 · Forecast155
Tue 22:00 · Forecast157
Tue 23:00 · Forecast157
Wed 00:00 · Forecast156
Wed 01:00 · Forecast155
Wed 02:00 · Forecast153
Wed 03:00 · Forecast152
Wed 04:00 · Forecast149
Wed 05:00 · Forecast146
Wed 06:00 · Forecast151
Wed 07:00 · Forecast152
Wed 08:00 · Forecast144
Wed 09:00 · Forecast132
Wed 10:00 · Forecast123
Wed 11:00 · Forecast118
Wed 12:00 · Forecast114
Wed 13:00 · Forecast112
Wed 14:00 · Forecast111
Wed 15:00 · Forecast110
Wed 16:00 · Forecast111
Wed 17:00 · Forecast113
Wed 18:00 · Forecast120
Wed 19:00 · Forecast143
Wed 20:00 · Forecast158
Wed 21:00 · Forecast165
Wed 22:00 · Forecast169
Wed 23:00 · Forecast171
Thu 00:00 · Forecast170
Thu 01:00 · Forecast167
Thu 02:00 · Forecast163
Thu 03:00 · Forecast158
Thu 04:00 · Forecast153
Thu 05:00 · Forecast147
Thu 06:00 · Forecast138
Thu 07:00 · Forecast141
Thu 08:00 · Forecast134
Thu 09:00 · Forecast119
Thu 10:00 · Forecast103
Thu 11:00 · Forecast95
Thu 12:00 · Forecast93
Thu 13:00 · Forecast94
Thu 14:00 · Forecast96
Thu 15:00 · Forecast98

Pollutants this hour

  • PM2.5 62.6 µg/m³ 24-hour mean 42.9 µg/m³ · 2.9× WHO’s 24-hour guideline (15) 146
  • PM10 72 µg/m³ 54
  • O₃ 10 µg/m³ 34
  • NO₂ 87 µg/m³ 43
  • SO₂ 44 µg/m³ 23
  • CO 0.68 mg/m³ 5

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
Taipei Taiwan 90
Tainan Taiwan 133
Kaohsiung Takao 133
Hangzhou China 158
Hong Kong Hong Kong 88
Shenzhen China 88
Dongguan China 113

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 Taichung’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 Taichung right now?
146 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 Taichung 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 Taichung get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 110 around 15:00 to 158 around 20:00 (4 Nov). Forecasts beyond a day are less certain.

How does Taichung compare with other cities?
Right now it is the 105th most polluted of 849 cities we track worldwide, and 1st of 4 in Taiwan, all on the same US EPA scale.

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