Fine particles
19µg/m³Moderate · 1 hourCAMS model • Open-Meteo
TainanAir quality, PM2.5 and PM10
Check PM2.5 and PM10 particle levels alongside ozone, nitrogen dioxide and other gases. Compare the latest available concentrations with recent days and explore changes in air pollution through the available historical records.
Tainan - latest available concentrations (September 27, 2026, 09:00 local time): PM2.5: 19 µg/m³, PM10: 23.3 µg/m³, O₃: 46 µg/m³, NO₂: 55.2 µg/m³, SO₂: 69.2 µg/m³, CO: 897 µg/m³. These are hourly CAMS model values for a point representing the city.
Air quality questions →Tainan · Air pollutant concentrations
Data time: September 27, 2026 · 09:00 · local timeParticulate matter
23.3µg/m³Fair · 1 hourOzone
46µg/m³Good · 1 hourNitrogen dioxide
55.2µg/m³Moderate · 1 hourSulphur dioxide
69.2µg/m³Moderate · 1 hourCarbon monoxide
897µg/m³PM2.5 vs PM10 - what is the difference? → · Models and monitoring stations →
DAILY DATA · Tainan
Tainan - air pollution over recent days (2026-08-31 - 2026-09-26)
Concentrations of all available pollutants for this city.
PM2.5Lowest 5.91 2026-08-31Highest 53.66 2026-09-242026-08-31 - 2026-09-26
PM10Lowest 6.23 2026-08-31Highest 55.47 2026-09-242026-08-31 - 2026-09-26
O₃Lowest 25.38 2026-09-01Highest 71.92 2026-09-062026-08-31 - 2026-09-26
NO₂Lowest 33.57 2026-09-02Highest 82.84 2026-09-242026-08-31 - 2026-09-26
SO₂Lowest 16.66 2026-09-02Highest 68.27 2026-09-242026-08-31 - 2026-09-26
COLowest 281.38 2026-09-06Highest 1,106.88 2026-09-242026-08-31 - 2026-09-26
Scroll the chart or table sideways to see the full period.
| Pollutant | 2026-09-26 | 2026-09-25 | 2026-09-24 | 2026-09-23 | 2026-09-22 | 2026-09-21 | 2026-09-20 | 2026-09-07 | 2026-09-06 | 2026-09-05 | 2026-09-04 | 2026-09-03 | 2026-09-02 | 2026-09-01 | 2026-08-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 | 32.36 | 49.85 | 53.66 | 34.89 | 25.84 | 24.73 | 35.71 | 43.99 | 39.08 | 39.23 | 22.47 | 14.34 | 7.43 | 10.33 | 5.91 |
| PM10 | 34.14 | 50.95 | 55.47 | 37.85 | 28.4 | 26.22 | 38.71 | 45.64 | 41.49 | 41.92 | 25.93 | 16.16 | 8.6 | 11 | 6.23 |
| O₃ | 45.54 | 61.33 | 43.58 | 38.88 | 38.17 | 56.83 | 71.75 | 71.13 | 71.92 | 44.79 | 46.08 | 51.54 | 50.88 | 25.38 | 26.67 |
| NO₂ | 62.28 | 69.93 | 82.84 | 77.66 | 69.92 | 58.43 | 57.7 | 60.67 | 48.02 | 73.96 | 60.5 | 53.28 | 33.57 | 45.85 | 39.95 |
| SO₂ | 41.27 | 51.11 | 68.27 | 50.95 | 44.94 | 42.53 | 45.88 | 50.12 | 43.34 | 56.57 | 39.05 | 27.69 | 16.66 | 28.38 | 18.58 |
| CO | 724.38 | 862.58 | 1,106.88 | 410.58 | 402.08 | 473.88 | 359.33 | 436.75 | 281.38 | 656.21 | 1,021.54 | 880.38 | 533.21 | 461 | 451.5 |
A dot on the chart and a dash in the table indicate missing data. The latest day may be incomplete.
AIR QUALITY ARCHIVE · Tainan
Tainan - air pollution history (2016-12 - 2020-05)
Compare monthly particle and gas concentrations in the available archive.
PM2.5Lowest 10.43 2017-06Highest 39.02 2019-012016-12 - 2020-05
PM10Lowest 20.83 2019-06Highest 81.9 2017-122016-12 - 2020-05
O₃ (ppm)Lowest 0.020667 2017-06Highest 0.04475 2020-042016-12 - 2020-05
NO₂ (ppm)Lowest 0.00667 2019-07Highest 0.0188 2016-122016-12 - 2020-05
SO₂ (ppm)Lowest 0.001937 2020-05Highest 0.00313 2017-092016-12 - 2020-05
CO (ppm)Lowest 0.204667 2017-06Highest 0.48775 2019-012016-12 - 2020-05
Scroll the chart or table sideways to see the full period.
| Pollutant | 2020-05 | 2020-04 | 2020-03 | 2020-02 | 2020-01 | 2019-12 | 2019-11 | 2019-10 | 2019-09 | 2019-08 | 2019-07 | 2019-06 | 2019-05 | 2019-04 | 2019-03 | 2019-02 | 2019-01 | 2018-12 | 2018-11 | 2018-10 | 2018-09 | 2018-08 | 2018-07 | 2018-06 | 2018-05 | 2018-04 | 2018-03 | 2018-02 | 2018-01 | 2017-12 | 2017-11 | 2017-10 | 2017-09 | 2017-08 | 2017-07 | 2017-06 | 2017-05 | 2017-04 | 2017-03 | 2017-02 | 2017-01 | 2016-12 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 µg/m³ | 12.07 | 23.55 | 25.18 | 27.55 | 28.07 | 23.32 | 25.75 | 28.18 | 20.07 | 13.25 | 11.35 | 10.45 | 18.68 | 22.83 | 28.45 | 30.47 | 39.02 | — | — | — | — | — | — | — | — | — | — | 35.02 | 29.1 | 32.1 | 28.78 | 24.02 | 25.38 | — | — | 10.43 | 21.53 | 26.63 | 36.93 | 36.9 | 35.57 | 37.4 |
| PM10 µg/m³ | 24.45 | 47.23 | 51.67 | 54.77 | 50.4 | 47.9 | 62.3 | 61.38 | 42.77 | 23.72 | 21.6 | 20.83 | 43.93 | 48.57 | 58.9 | 63.4 | 80.6 | — | — | — | — | — | — | — | — | — | — | 72 | 64.4 | 81.9 | 74.43 | 63.88 | 49.38 | — | — | 29.83 | 44.83 | 51.6 | 71.5 | 75.33 | 74.03 | 78 |
| O₃ (ppm) | 0.026475 | 0.04475 | 0.037125 | 0.03315 | 0.032225 | 0.02695 | 0.037525 | 0.044725 | 0.04005 | 0.02705 | 0.0207 | 0.021225 | 0.033675 | 0.0337 | 0.033925 | 0.03135 | 0.03025 | — | — | — | — | — | — | — | — | — | — | 0.025975 | 0.023625 | 0.028325 | 0.0299 | 0.03675 | 0.038075 | — | — | 0.020667 | 0.035767 | 0.037567 | 0.038533 | 0.0302 | 0.028333 | 0.022633 |
| NO₂ (ppm) | 0.007875 | 0.0117 | 0.0129 | 0.01385 | 0.01475 | 0.01535 | 0.014025 | 0.010488 | 0.008577 | 0.00678 | 0.00667 | 0.007557 | 0.010193 | 0.01075 | 0.0142 | 0.0129 | 0.0165 | — | — | — | — | — | — | — | — | — | — | 0.01675 | 0.016775 | 0.016775 | 0.01425 | 0.011685 | 0.010142 | — | — | 0.00738 | 0.010153 | 0.012567 | 0.0159 | 0.015567 | 0.0165 | 0.0188 |
| SO₂ (ppm) | 0.001937 | 0.002385 | 0.00249 | 0.00238 | 0.002333 | 0.002217 | 0.002625 | 0.002732 | 0.002445 | 0.002053 | 0.001988 | 0.00214 | 0.002308 | 0.00242 | 0.002507 | 0.002517 | 0.002708 | — | — | — | — | — | — | — | — | — | — | 0.00226 | 0.00254 | 0.00294 | 0.0027 | 0.002857 | 0.00313 | — | — | 0.002453 | 0.00297 | 0.002853 | 0.003097 | 0.00261 | 0.003087 | 0.00286 |
| CO (ppm) | 0.22575 | 0.362 | 0.3915 | 0.397 | 0.47875 | 0.39075 | 0.35425 | 0.357 | 0.28575 | 0.23275 | 0.219 | 0.2415 | 0.35825 | 0.3555 | 0.4435 | 0.43525 | 0.48775 | — | — | — | — | — | — | — | — | — | — | 0.465 | 0.43375 | 0.42125 | 0.3795 | 0.33425 | 0.29575 | — | — | 0.204667 | 0.304 | 0.375667 | 0.476667 | 0.480333 | 0.457 | 0.479 |
A dot on the chart and a dash in the table indicate missing data. Historical values do not describe today’s air quality.
Historical data by station 4
AIR QUALITY ARCHIVE · Annan
Annan
Station code: Annan
Monthly monitoring station data.
PM2.5Lowest 10.6 2017-06Highest 36 2017-032016-12 - 2020-05
PM10Lowest 21.3 2019-07Highest 83.7 2017-122016-12 - 2020-05
O₃ (ppm)Lowest 0.0206 2019-07Highest 0.0468 2020-042016-12 - 2020-05
NO₂ (ppm)Lowest 0.008 2020-05Highest 0.0181 2016-122016-12 - 2020-05
SO₂ (ppm)Lowest 0.00183 2020-05Highest 0.00319 2017-032016-12 - 2020-05
CO (ppm)Lowest 0.226 2020-05Highest 0.474 2019-012016-12 - 2020-05
Scroll the chart or table sideways to see the full period.
| Pollutant | 2020-05 | 2020-04 | 2020-03 | 2020-02 | 2020-01 | 2019-12 | 2019-11 | 2019-10 | 2019-09 | 2019-08 | 2019-07 | 2019-06 | 2019-05 | 2019-04 | 2019-03 | 2019-02 | 2019-01 | 2018-12 | 2018-11 | 2018-10 | 2018-09 | 2018-08 | 2018-07 | 2018-06 | 2018-05 | 2018-04 | 2018-03 | 2018-02 | 2018-01 | 2017-12 | 2017-11 | 2017-10 | 2017-09 | 2017-08 | 2017-07 | 2017-06 | 2017-05 | 2017-04 | 2017-03 | 2017-02 | 2017-01 | 2016-12 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 µg/m³ | 12.2 | 24.8 | 26.2 | 28.6 | 28.7 | 23.9 | 26.2 | 28.7 | 22.4 | 16.2 | 15 | 11.6 | 19.4 | 24 | 28.1 | 27.2 | 35.7 | — | — | — | — | — | — | — | — | — | — | 34.6 | 29 | 30.2 | 27.8 | 24.7 | 25.6 | — | — | 10.6 | 21.2 | 26.5 | 36 | 34.7 | 33.1 | 35.5 |
| PM10 µg/m³ | 26.2 | 51.6 | 53.7 | 55.1 | 54.5 | 49.6 | 63.7 | 64 | 42 | 25.3 | 21.3 | 27.3 | 50.2 | 54.9 | 62 | 65.8 | 80.6 | — | — | — | — | — | — | — | — | — | — | 74.6 | 65.1 | 83.7 | 74.2 | 68.1 | 52.2 | — | — | 34 | 48.9 | 55.6 | 77.2 | 81.3 | 78.1 | 82.9 |
| O₃ (ppm) | 0.0277 | 0.0468 | 0.039 | 0.0341 | 0.0337 | 0.0286 | 0.0385 | 0.0459 | 0.0397 | 0.0275 | 0.0206 | 0.022 | 0.0343 | 0.0359 | 0.0378 | 0.0344 | 0.0342 | — | — | — | — | — | — | — | — | — | — | 0.0271 | 0.0256 | 0.0316 | 0.0339 | 0.0395 | 0.0405 | — | — | 0.0209 | 0.0368 | 0.0387 | 0.04 | 0.0308 | 0.0288 | 0.0223 |
| NO₂ (ppm) | 0.008 | 0.0123 | 0.0137 | 0.0138 | 0.0143 | 0.0154 | 0.0141 | 0.0116 | 0.0104 | 0.00932 | 0.00974 | 0.0102 | 0.0119 | 0.012 | 0.0146 | 0.0135 | 0.0161 | — | — | — | — | — | — | — | — | — | — | 0.0165 | 0.0166 | 0.0162 | 0.0139 | 0.0126 | 0.0114 | — | — | 0.00814 | 0.0108 | 0.0129 | 0.0158 | 0.0147 | 0.0152 | 0.0181 |
| SO₂ (ppm) | 0.00183 | 0.00217 | 0.00235 | 0.00231 | 0.00223 | 0.00213 | 0.00247 | 0.00239 | 0.00227 | 0.00213 | 0.00206 | 0.00223 | 0.00218 | 0.00231 | 0.00229 | 0.00239 | 0.00259 | — | — | — | — | — | — | — | — | — | — | 0.00232 | 0.00233 | 0.00293 | 0.00267 | 0.00281 | 0.00268 | — | — | 0.0025 | 0.00265 | 0.00263 | 0.00319 | 0.00254 | 0.00274 | 0.0025 |
| CO (ppm) | 0.226 | 0.366 | 0.391 | 0.396 | 0.474 | 0.386 | 0.349 | 0.363 | 0.29 | 0.252 | 0.251 | 0.273 | 0.374 | 0.359 | 0.432 | 0.426 | 0.474 | — | — | — | — | — | — | — | — | — | — | 0.45 | 0.421 | 0.407 | 0.368 | 0.333 | 0.295 | — | — | 0.228 | 0.306 | 0.376 | 0.441 | 0.42 | 0.42 | 0.452 |
A dot on the chart and a dash in the table indicate missing data. Historical values do not describe today’s air quality.
How should I interpret the data and averaging period? →
OpenAQ ↗Taiwan
AIR QUALITY ARCHIVE · Shanhua
Shanhua
Station code: Shanhua
Monthly monitoring station data.
PM2.5Lowest 8.63 2019-06Highest 38.3 2019-012016-12 - 2020-05
PM10Lowest 19.4 2019-06Highest 86.8 2019-012016-12 - 2020-05
O₃ (ppm)Lowest 0.0201 2017-06Highest 0.0434 2019-102016-12 - 2020-05
NO₂ (ppm)Lowest 0.00417 2019-07Highest 0.0171 2016-122016-12 - 2020-05
SO₂ (ppm)Lowest 0.00173 2019-08Highest 0.00339 2017-012016-12 - 2020-05
CO (ppm)Lowest 0.15 2017-06Highest 0.504 2017-022016-12 - 2020-05
Scroll the chart or table sideways to see the full period.
| Pollutant | 2020-05 | 2020-04 | 2020-03 | 2020-02 | 2020-01 | 2019-12 | 2019-11 | 2019-10 | 2019-09 | 2019-08 | 2019-07 | 2019-06 | 2019-05 | 2019-04 | 2019-03 | 2019-02 | 2019-01 | 2018-12 | 2018-11 | 2018-10 | 2018-09 | 2018-08 | 2018-07 | 2018-06 | 2018-05 | 2018-04 | 2018-03 | 2018-02 | 2018-01 | 2017-12 | 2017-11 | 2017-10 | 2017-09 | 2017-08 | 2017-07 | 2017-06 | 2017-05 | 2017-04 | 2017-03 | 2017-02 | 2017-01 | 2016-12 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 µg/m³ | 12.5 | 24.2 | 25.7 | 27.5 | 27.6 | 23.7 | 25.9 | 28.3 | 19.5 | 11.5 | 9.19 | 8.63 | 19.3 | 23.4 | 27.9 | 30.6 | 38.3 | — | — | — | — | — | — | — | — | — | — | 34.8 | 29.5 | 32.2 | 30 | 23.9 | 25 | — | — | 10.2 | 21.6 | 26.7 | 37.3 | 37.2 | 35.5 | 37.6 |
| PM10 µg/m³ | 25.2 | 46.3 | 52.4 | 54.1 | 43.8 | 49 | 63 | 61 | 45.7 | 22.5 | 21.9 | 19.4 | 43.6 | 51.1 | 63.3 | 68.2 | 86.8 | — | — | — | — | — | — | — | — | — | — | 68.1 | 54.2 | 71.1 | 70.4 | 62.7 | 49.1 | — | — | 28.2 | 44 | 51.1 | 69.7 | 73.5 | 72.1 | 75.4 |
| O₃ (ppm) | 0.0244 | 0.0416 | 0.0355 | 0.0323 | 0.0316 | 0.0258 | 0.0372 | 0.0434 | 0.0432 | 0.0268 | 0.0205 | 0.0202 | 0.0313 | 0.0316 | 0.0335 | 0.0317 | 0.0296 | — | — | — | — | — | — | — | — | — | — | 0.024 | 0.0213 | 0.026 | 0.0272 | 0.0345 | 0.0334 | — | — | 0.0201 | 0.0309 | 0.033 | 0.0344 | 0.0279 | 0.0262 | 0.0221 |
| NO₂ (ppm) | 0.0085 | 0.0114 | 0.0118 | 0.0124 | 0.0132 | 0.0141 | 0.0124 | 0.00735 | 0.00584 | 0.00432 | 0.00417 | 0.0043 | 0.00677 | 0.0078 | 0.0115 | 0.0101 | 0.0151 | — | — | — | — | — | — | — | — | — | — | 0.015 | 0.0157 | 0.0156 | 0.0131 | 0.00974 | 0.00868 | — | — | 0.007 | 0.00916 | 0.0117 | 0.0145 | 0.0145 | 0.0158 | 0.0171 |
| SO₂ (ppm) | 0.00192 | 0.00297 | 0.00297 | 0.00283 | 0.00252 | 0.00245 | 0.00303 | 0.0029 | 0.00261 | 0.00173 | 0.00179 | 0.00193 | 0.00241 | 0.0025 | 0.00265 | 0.00268 | 0.00272 | — | — | — | — | — | — | — | — | — | — | 0.00245 | 0.00283 | 0.00313 | 0.0029 | 0.00284 | 0.00305 | — | — | 0.00229 | 0.0031 | 0.00313 | 0.003 | 0.0025 | 0.00339 | 0.00308 |
| CO (ppm) | 0.216 | 0.336 | 0.361 | 0.358 | 0.44 | 0.352 | 0.318 | 0.316 | 0.248 | 0.183 | 0.168 | 0.186 | 0.311 | 0.315 | 0.395 | 0.394 | 0.445 | — | — | — | — | — | — | — | — | — | — | 0.412 | 0.399 | 0.381 | 0.334 | 0.285 | 0.246 | — | — | 0.15 | 0.257 | 0.329 | 0.458 | 0.504 | 0.425 | 0.425 |
A dot on the chart and a dash in the table indicate missing data. Historical values do not describe today’s air quality.
How should I interpret the data and averaging period? →
OpenAQ ↗Taiwan
AIR QUALITY ARCHIVE · Tainan
Tainan
Station code: Tainan
Monthly monitoring station data.
PM2.5Lowest 9.47 2019-06Highest 38.3 2019-012017-09 - 2020-05
PM10Lowest 17.6 2019-06Highest 81.2 2019-012017-09 - 2020-05
O₃ (ppm)Lowest 0.02 2019-07Highest 0.0468 2019-102017-09 - 2020-05
NO₂ (ppm)Lowest 0.00717 2020-05Highest 0.0184 2019-012017-09 - 2020-05
SO₂ (ppm)Lowest 0.00183 2020-05Highest 0.00347 2017-092017-09 - 2020-05
CO (ppm)Lowest 0.223 2020-05Highest 0.561 2019-012017-09 - 2020-05
Scroll the chart or table sideways to see the full period.
| Pollutant | 2020-05 | 2020-04 | 2020-03 | 2020-02 | 2020-01 | 2019-12 | 2019-11 | 2019-10 | 2019-09 | 2019-08 | 2019-07 | 2019-06 | 2019-05 | 2019-04 | 2019-03 | 2019-02 | 2019-01 | 2018-12 | 2018-11 | 2018-10 | 2018-09 | 2018-08 | 2018-07 | 2018-06 | 2018-05 | 2018-04 | 2018-03 | 2018-02 | 2018-01 | 2017-12 | 2017-11 | 2017-10 | 2017-09 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 µg/m³ | 11.2 | 22.7 | 24.3 | 27.9 | 28.9 | 23.8 | 26 | 28.4 | 19.9 | 12.1 | 10.1 | 9.47 | 19.1 | 24.5 | 28.9 | 28.8 | 38.3 | — | — | — | — | — | — | — | — | — | — | 35.1 | 29.7 | 32.9 | 29.1 | 23.8 | 22.4 |
| PM10 µg/m³ | 21.7 | 46.4 | 50.5 | 55.8 | 53 | 48.6 | 62.1 | 62.5 | 42.8 | 24.3 | 20.9 | 17.6 | 37 | 42.7 | 56.2 | 59.5 | 81.2 | — | — | — | — | — | — | — | — | — | — | 65.4 | 63.8 | 80.6 | 68.6 | 58.7 | 42.1 |
| O₃ (ppm) | 0.0271 | 0.0466 | 0.0373 | 0.033 | 0.0331 | 0.027 | 0.0384 | 0.0468 | 0.0394 | 0.0266 | 0.02 | 0.0209 | 0.0363 | 0.036 | 0.0364 | 0.0327 | 0.0315 | — | — | — | — | — | — | — | — | — | — | 0.0277 | 0.0254 | 0.029 | 0.0311 | 0.0381 | 0.0418 |
| NO₂ (ppm) | 0.00717 | 0.0121 | 0.0136 | 0.0153 | 0.0167 | 0.0168 | 0.0153 | 0.0122 | 0.0099 | 0.00803 | 0.00774 | 0.00893 | 0.0119 | 0.0121 | 0.0162 | 0.0146 | 0.0184 | — | — | — | — | — | — | — | — | — | — | 0.0181 | 0.0178 | 0.0176 | 0.0151 | 0.0132 | 0.0106 |
| SO₂ (ppm) | 0.00183 | 0.00203 | 0.00248 | 0.00238 | 0.00252 | 0.00226 | 0.00267 | 0.00306 | 0.0026 | 0.00235 | 0.00216 | 0.00237 | 0.00259 | 0.0026 | 0.00274 | 0.00257 | 0.00297 | — | — | — | — | — | — | — | — | — | — | 0.00218 | 0.00243 | 0.00283 | 0.00263 | 0.00313 | 0.00347 |
| CO (ppm) | 0.223 | 0.399 | 0.427 | 0.452 | 0.533 | 0.455 | 0.407 | 0.405 | 0.327 | 0.272 | 0.251 | 0.269 | 0.404 | 0.396 | 0.51 | 0.483 | 0.561 | — | — | — | — | — | — | — | — | — | — | 0.553 | 0.505 | 0.488 | 0.452 | 0.398 | 0.348 |
A dot on the chart and a dash in the table indicate missing data. Historical values do not describe today’s air quality.
How should I interpret the data and averaging period? →
OpenAQ ↗Taiwan
AIR QUALITY ARCHIVE · Xinying
Xinying
Station code: Xinying
Monthly monitoring station data.
PM2.5Lowest 10.5 2017-06Highest 43.8 2019-012016-12 - 2020-05
PM10Lowest 19 2019-06Highest 92.2 2017-122016-12 - 2020-05
O₃ (ppm)Lowest 0.021 2017-06Highest 0.044 2020-042016-12 - 2020-05
NO₂ (ppm)Lowest 0.00503 2019-07Highest 0.0212 2016-122016-12 - 2020-05
SO₂ (ppm)Lowest 0.00194 2019-07Highest 0.00332 2017-092016-12 - 2020-05
CO (ppm)Lowest 0.206 2019-07Highest 0.56 2016-122016-12 - 2020-05
Scroll the chart or table sideways to see the full period.
| Pollutant | 2020-05 | 2020-04 | 2020-03 | 2020-02 | 2020-01 | 2019-12 | 2019-11 | 2019-10 | 2019-09 | 2019-08 | 2019-07 | 2019-06 | 2019-05 | 2019-04 | 2019-03 | 2019-02 | 2019-01 | 2018-12 | 2018-11 | 2018-10 | 2018-09 | 2018-08 | 2018-07 | 2018-06 | 2018-05 | 2018-04 | 2018-03 | 2018-02 | 2018-01 | 2017-12 | 2017-11 | 2017-10 | 2017-09 | 2017-08 | 2017-07 | 2017-06 | 2017-05 | 2017-04 | 2017-03 | 2017-02 | 2017-01 | 2016-12 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 µg/m³ | 12.4 | 22.5 | 24.5 | 26.2 | 27.1 | 21.9 | 24.9 | 27.3 | 18.5 | 13.2 | 11.1 | 12.1 | 16.9 | 19.4 | 28.9 | 35.3 | 43.8 | — | — | — | — | — | — | — | — | — | — | 35.6 | 28.2 | 33.1 | 28.2 | 23.7 | 28.5 | — | — | 10.5 | 21.8 | 26.7 | 37.5 | 38.8 | 38.1 | 39.1 |
| PM10 µg/m³ | 24.7 | 44.6 | 50.1 | 54.1 | 50.3 | 44.4 | 60.4 | 58 | 40.6 | 22.8 | 22.3 | 19 | 44.9 | 45.6 | 54.1 | 60.1 | 73.8 | — | — | — | — | — | — | — | — | — | — | 79.9 | 74.5 | 92.2 | 84.5 | 66 | 54.1 | — | — | 27.3 | 41.6 | 48.1 | 67.6 | 71.2 | 71.9 | 75.7 |
| O₃ (ppm) | 0.0267 | 0.044 | 0.0367 | 0.0332 | 0.0305 | 0.0264 | 0.036 | 0.0428 | 0.0379 | 0.0273 | 0.0217 | 0.0218 | 0.0328 | 0.0313 | 0.028 | 0.0266 | 0.0257 | — | — | — | — | — | — | — | — | — | — | 0.0251 | 0.0222 | 0.0267 | 0.0274 | 0.0349 | 0.0366 | — | — | 0.021 | 0.0396 | 0.041 | 0.0412 | 0.0319 | 0.03 | 0.0235 |
| NO₂ (ppm) | 0.00783 | 0.011 | 0.0125 | 0.0139 | 0.0148 | 0.0151 | 0.0143 | 0.0108 | 0.00817 | 0.00545 | 0.00503 | 0.0068 | 0.0102 | 0.0111 | 0.0145 | 0.0134 | 0.0164 | — | — | — | — | — | — | — | — | — | — | 0.0174 | 0.017 | 0.0177 | 0.0149 | 0.0112 | 0.00989 | — | — | 0.007 | 0.0105 | 0.0131 | 0.0174 | 0.0175 | 0.0185 | 0.0212 |
| SO₂ (ppm) | 0.00217 | 0.00237 | 0.00216 | 0.002 | 0.00206 | 0.00203 | 0.00233 | 0.00258 | 0.0023 | 0.002 | 0.00194 | 0.00203 | 0.00205 | 0.00227 | 0.00235 | 0.00243 | 0.00255 | — | — | — | — | — | — | — | — | — | — | 0.00209 | 0.00257 | 0.00287 | 0.0026 | 0.00265 | 0.00332 | — | — | 0.00257 | 0.00316 | 0.0028 | 0.0031 | 0.00279 | 0.00313 | 0.003 |
| CO (ppm) | 0.238 | 0.347 | 0.387 | 0.382 | 0.468 | 0.37 | 0.343 | 0.344 | 0.278 | 0.224 | 0.206 | 0.238 | 0.344 | 0.352 | 0.437 | 0.438 | 0.471 | — | — | — | — | — | — | — | — | — | — | 0.445 | 0.41 | 0.409 | 0.364 | 0.321 | 0.294 | — | — | 0.236 | 0.349 | 0.422 | 0.531 | 0.517 | 0.526 | 0.56 |
A dot on the chart and a dash in the table indicate missing data. Historical values do not describe today’s air quality.
How should I interpret the data and averaging period? →
OpenAQ ↗Taiwan
Environment and quality of life ratings · Tainan
Archived ratings of the local environment: green spaces, cleanliness, noise and water quality. Opinion indicators are separate from pollutant concentration measurements.
| Indicator | Tainan | Hong Kong | Macau | Mexico | Philippines | South Korea |
|---|---|---|---|---|---|---|
| Green and Parks in the City | 49% | 52% | — | 56% | 45% | 61% |
| Pleasure of spending time in the city | 40% | 43% | — | 57% | 39% | 43% |
| Air Pollution | 70% | 67% | — | 53% | 64% | 69% |
| Garbage Disposal | 59% | 52% | — | 52% | 35% | 62% |
| Availability and quality of drinking water | 54% | 66% | — | 57% | 54% | 72% |
| Cleanliness and tidiness | 58% | 54% | — | 45% | 38% | 63% |
| Noise and Light pollution | 66% | 66% | — | 48% | 60% | 50% |
| Water Pollution | 70% | 53% | — | 55% | 74% | 38% |
Air quality in nearby cities
All cities →Taiwan↗
Kaohsiung City
PM2.519
PM1023.3
µg/m³
PM2.5 · ModerateNO₂ 55.2O₃ 46
September 27, 202609:00
Taiwan↗
Douliu
PM2.519.9
PM1024
µg/m³
PM2.5 · ModerateNO₂ 34.9O₃ 89
September 27, 202609:00
Taiwan↗
Taitung City
PM2.512.2
PM1012.5
µg/m³
PM2.5 · FairNO₂ 13.7O₃ 108
September 27, 202609:00
Taiwan↗
Nantou
PM2.520.8
PM1021.4
µg/m³
PM2.5 · ModerateNO₂ 23O₃ 120
September 27, 202609:00
Taiwan↗
Taichung City
PM2.520.8
PM1021.4
µg/m³
PM2.5 · ModerateNO₂ 23O₃ 120
September 27, 202609:00
Taiwan↗
Hualian
PM2.528.4
PM1029.6
µg/m³
PM2.5 · ModerateNO₂ 9.1O₃ 128
September 27, 202609:00
Taiwan↗
Hsinchu
PM2.519.2
PM1020.3
µg/m³
PM2.5 · ModerateNO₂ 24.7O₃ 105
September 27, 202609:00
Taiwan↗
Taoyuan
PM2.521.8
PM1022.4
µg/m³
PM2.5 · ModerateNO₂ 26.3O₃ 113
September 27, 202609:00
Taiwan · air quality in other cities
WEATHER & SURROUNDINGS
Tainan · weather forecast
Daily maximum and minimum temperatures. Forecast point: 23.1417, 120.2513.
Scroll the forecast to see the following days.
Tainan · September 25, 2026: minimum temperature 26°C, maximum 32.9°C. Wind: 20.1 km/h. Humidity: 60%.
Full forecast: temperature, rainfall, wind and humidity
| Date | Day °C | Min °C | Max °C | Night °C | Rain mm | Wind m/s | Humidity % | Clouds % |
|---|---|---|---|---|---|---|---|---|
| 2026-09-25 | 31.3 | 26 | 32.9 | 26.9 | 0.5 | 5.6 | 60 | 99 |
| 2026-09-26 | 32.7 | 25.5 | 32.8 | 26.6 | 0.1 | 4.4 | 55 | 3 |
| 2026-09-27 | 32.7 | 25.6 | 33.2 | 26.3 | 0.2 | 5.1 | 42 | 38 |
| 2026-09-28 | 32.6 | 25.6 | 33.5 | 29.1 | 2.4 | 5 | 48 | 1 |
| 2026-09-29 | 32.7 | 27.8 | 33.4 | 29.3 | 0.2 | 4.8 | 43 | 17 |
| 2026-09-30 | 32.7 | 28.2 | 32.7 | 29.1 | 0.1 | 5.1 | 53 | 51 |
| 2026-10-01 | 32.7 | 28.2 | 32.7 | 28.6 | 1.5 | 6.9 | 51 | 11 |
| 2026-10-02 | 29.6 | 27.4 | 31.6 | 27.4 | 4.4 | 4.5 | 59 | 100 |
| 2026-10-03 | 31.5 | 26.2 | 32.6 | 27.5 | 0.2 | 6.8 | 50 | 72 |
| 2026-10-04 | 31.4 | 26.2 | 32.4 | 27.3 | 0.3 | 6.4 | 52 | 90 |
| 2026-10-05 | 31.7 | 26.2 | 32.8 | 26.9 | 0.6 | 7.6 | 51 | 100 |
| 2026-10-06 | 31.3 | 26 | 32.3 | 26.2 | 0.8 | 7.2 | 48 | 6 |
| 2026-10-07 | 27.4 | 24.1 | 28.6 | 24.1 | 0.8 | 9.1 | 48 | 98 |
| 2026-10-08 | 25.2 | 22.5 | 27.5 | 22.5 | — | 9.6 | 47 | 100 |
| 2026-10-09 | 24.8 | 22.2 | 28.9 | 24.5 | 0.5 | 5.9 | 46 | 96 |
| 2026-10-10 | 28.3 | 23.4 | 30 | 26.6 | 1.4 | 4.9 | 46 | 1 |
| 2026-10-11 | 29.6 | 25.9 | 30.3 | 27 | — | 5.1 | 43 | 12 |
UV index by day · Tainan
City data.
SPF 50, long sleeves and shade between 10:00-16:00.
0-2 low3-5 moderate6-7 high8-10 very high11+ extreme
Scroll the forecast to see the following days.
Tainan · September 26, 2026: UV index: 8.2 .
| Indicator | 2026-09-26 | 2026-09-27 | 2026-09-28 | 2026-09-29 | 2026-09-30 | 2026-10-01 | 2026-10-02 | 2026-10-03 | 2026-10-04 | 2026-10-05 | 2026-10-06 | 2026-10-07 | 2026-10-08 | 2026-10-09 | 2026-10-10 | 2026-10-11 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index | 8.2 | 8.1 | 8.1 | 8.1 | 7.6 | 7.3 | 5.6 | 7.7 | 7.5 | 7 | 7.8 | 3.7 | 5.5 | 6.9 | 7.9 | — |
AIR QUALITY QUESTIONS
Tainan · air pollution - questions and answers
What do the latest air quality data show for Tainan?
Tainan - latest available concentrations (September 27, 2026, 09:00 local time): PM2.5: 19 µg/m³, PM10: 23.3 µg/m³, O₃: 46 µg/m³, NO₂: 55.2 µg/m³, SO₂: 69.2 µg/m³, CO: 897 µg/m³. These are hourly CAMS model values for a point representing the city.
When was PM2.5 highest in Tainan over the past week?
The highest available daily mean PM2.5 was 53.7 µg/m³ (September 24, 2026). This comparison covers 7 days with data in the seven days before September 27, 2026. The day of the latest reading is excluded because it may be incomplete.
What period does the pollution history for Tainan cover?
Available monthly means cover 2016-12 - 2020-05. The tables include PM2.5, PM10, O₃ (ppm), NO₂ (ppm), SO₂ (ppm), CO (ppm). Missing values are marked with a dash, not treated as zero. Monthly archives and current model data may come from different sources.
Is the PM2.5 concentration for Tainan an AQI score?
No. PM2.5 and PM10 are concentrations in µg/m³. AQI is a separate index calculated using a defined scale. When comparing air quality, also check other pollutants, the date and the averaging period.
What UV index does the available forecast show for Tainan?
For September 26, 2026, the forecast UV index is 8.2. The UV section also shows the following available days.
What wind speed is forecast for Tainan?
For September 25, 2026, forecast wind speed is 20.1 km/h. The weather table includes wind, temperature and other available parameters for subsequent days.
PM2.5 · PM10 · NO₂ · O₃
Understanding air quality and pollution data
What do PM2.5 and PM10 mean?
PM2.5 and PM10 are fractions of airborne particulate matter. PM2.5 covers fine particles up to 2.5 micrometres in diameter, while PM10 covers particles up to 10 micrometres. Concentrations in µg/m³ tell you how many micrograms of particles are present in a cubic metre of air. Compare values over the same time period.
Where does the air pollution data come from?
The latest concentrations come from the CAMS atmospheric model via Open-Meteo for each city’s coordinates. Values describe a model area, so conditions on individual streets may differ. Historical monitoring station data is shown separately where available.
How does PM2.5 concentration differ from AQI?
PM2.5 is the concentration of one particle fraction, expressed in µg/m³. AQI is an index calculated using a particular scale and thresholds. The pollutant cards show concentrations. Our city ranking compares PM2.5; PM10, ozone, nitrogen dioxide and other available gases add to the picture of air quality.
Which dates do the values and charts cover?
Each current value has a data date and time. Current concentration cards show the latest available hour, daily charts summarise individual days, and monthly records let you compare longer periods. These values represent different time intervals.
How can I check pollution in my city?
Search for your city and open its air quality page. Start with PM2.5 and PM10, then check the other available pollutants and the data timestamp. Charts and tables help you compare concentrations over time. Weather and historical climate information complement the pollution data.