Air quality

Air quality in Tainan today

Updated

Moderate (US AQI 94) Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. Model estimate for Mon, Oct 26, 2:00 am (18:00 UTC).

Live AQI, PM2.5, PM10 and ozone for Tainan, Taiwan, Taiwan, with a 48-hour forecast and the best time to be outside.

US AQI now
94 Moderate
PM2.5
57 µg/m³ 3.8× WHO 24-h guideline
PM10
58 µg/m³
Ozone
2 µg/m³
Dominant pollutant
PM2.5 sub-index 94
Best hour today
6:00 am AQI 105
European AQI
66

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Air quality in Tainan right now

Right now the modelled US Air Quality Index for Tainan, Taiwan, Taiwan is 94, which falls in the "Moderate" band (up to 100). Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors.

The index is driven mainly by PM2.5, whose own sub-index is 94. Fine and coarse particles come from traffic, heating, industry, dust and smoke; they build up on calm nights and clear when wind or rain arrives.

PM2.5 is 57 µg/m³, 3.8 times the WHO 24-hour guideline of 15 µg/m³; PM10 is 58 µg/m³ against a guideline of 45; ozone is 2 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 72 µg/m³ (above the 24-hour guideline of 25).

Also this hour: sulphur dioxide at 48 µg/m³, carbon monoxide 440 µg/m³.

Tainan AQI forecast: next 48 hours

Over the next 24 hours the AQI is forecast to range from 94 around Mon 2:00 am to 122 around Mon 8:00 pm, from "Moderate" at best to "Unhealthy for Sensitive Groups" at worst.

The following day is expected to be worse, averaging about 119 against 113 for the next 24 hours.

Local time (Asia/Taipei)US AQICategoryPM2.5 µg/m³PM10 µg/m³Ozone µg/m³
Mon 2:00 am94Moderate57582
Mon 5:00 am103Unhealthy for Sensitive Groups39.8402
Mon 8:00 am108Unhealthy for Sensitive Groups26.92719
Mon 11:00 am112Unhealthy for Sensitive Groups28.62985
Mon 2:00 pm116Unhealthy for Sensitive Groups33.935120
Mon 5:00 pm118Unhealthy for Sensitive Groups41.14375
Mon 8:00 pm122Unhealthy for Sensitive Groups56.5575
Mon 11:00 pm120Unhealthy for Sensitive Groups51525
Tue 2:00 am116Unhealthy for Sensitive Groups45.8476
Tue 5:00 am114Unhealthy for Sensitive Groups41.9435
Tue 8:00 am116Unhealthy for Sensitive Groups37.53820
Tue 11:00 am118Unhealthy for Sensitive Groups26.82974
Tue 2:00 pm117Unhealthy for Sensitive Groups35.739127
Tue 5:00 pm118Unhealthy for Sensitive Groups515669
Tue 8:00 pm121Unhealthy for Sensitive Groups68.9736
Tue 11:00 pm125Unhealthy for Sensitive Groups65.4695
Wed 2:00 am129Unhealthy for Sensitive Groups57.2636

Every third hour of the CAMS forecast via Open-Meteo. US AQI uses rolling averages (24 h for particles, 8 h for ozone), so it moves more slowly than the hourly concentrations.

Best time to be outside in Tainan today

Between 6 am and 9 pm local time, the cleanest air today is forecast around 6:00 am (AQI 105, Unhealthy for Sensitive Groups) and the worst around 8:00 pm (AQI 122). That is a swing of 17 points, so a run or walk around 6:00 am is noticeably better.

Tainan vs the rest of Taiwan

Across 19 Taiwan cities we track, the average US AQI right now is 67 (Moderate). Tainan at 94 is 27 points worse than average.

It ranks 17 of 19 from cleanest to most polluted; the cleanest is Hsinchu (57) and the most polluted Yongkang (94).

For context, the median across 3,909 cities worldwide is 57.

Air quality in cities near Tainan

CityDistanceUS AQICategoryPM2.5 µg/m³
Yongkang6 km94Moderate57
Kaohsiung43 km94Moderate57
Fengshan44 km94Moderate57
Xingang64 km61Moderate26.4
Taichung137 km79Moderate31.9
Toufen202 km57Moderate14.7
Hsinchu216 km57Moderate14.7
Zhubei221 km57Moderate14.7

Model vs measured

We found no measured PM2.5 sensor cell within 25 km of Tainan, so the numbers on this page are model estimates. Models capture regional pollution well but can miss very local sources such as a busy road or a nearby fire.

Wildfire smoke

PM2.5 is forecast to reach 57 µg/m³ in the next 24 hours while NASA satellites detected 1 fire hotspot within 300 km in the last day (nearest about 247 km away). Smoke is a likely contributor: keep windows closed, run an air purifier or HVAC filter, and check the fire map before heading out.

Advice for sensitive groups

At 94, most people are fine outdoors. If you are unusually sensitive to PM2.5, keep long or intense workouts to the cleaner hours shown above.

What the US AQI numbers mean

US AQICategoryWhat it means
0-50GoodAir quality is satisfactory and poses little or no risk; a good time for outdoor activity.
51-100ModerateAcceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors.
101-150Unhealthy for Sensitive GroupsPeople with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors.
151-200UnhealthyEveryone should reduce prolonged or heavy exertion outdoors; sensitive groups should avoid it and keep windows closed.
201-300Very UnhealthyHealth alert: everyone should avoid prolonged or heavy exertion outdoors, and sensitive groups should stay indoors.
301-500HazardousEmergency conditions: everyone should avoid all outdoor physical activity and stay indoors with filtered air if possible. The scale tops out at 500; heavier dust or smoke is shown as 500.

Values on this page are modelled by CAMS (Copernicus) and served by Open-Meteo; they are estimates for the area around the city centre, not readings from an official monitor.

Nearby cities

More for Tainan

Air quality elsewhere

Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), NASA FIRMS.