CAMS model • Open-Meteo

NantouAir 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.

Nantou - latest available concentrations (October 23, 2026, 09:00 local time): PM2.5: 4.4 µg/m³, PM10: 4.5 µg/m³, O₃: 35 µg/m³, NO₂: 25.8 µg/m³, SO₂: 8.1 µg/m³, CO: 279 µg/m³. These are hourly CAMS model values for a point representing the city.

Air quality questions →

Nantou · Air pollutant concentrations

Data time: October 23, 2026 · 09:00 · local time

PM2.5

Fine particles

4.4µg/m³Good · 1 hour

PM10

Particulate matter

4.5µg/m³Good · 1 hour

O₃

Ozone

35µg/m³Good · 1 hour

NO₂

Nitrogen dioxide

25.8µg/m³Moderate · 1 hour

SO₂

Sulphur dioxide

8.1µg/m³Good · 1 hour

Carbon monoxide

279µg/m³

PM2.5 vs PM10 - what is the difference? → · Models and monitoring stations →

DAILY DATA · Nantou

Nantou - air pollution over recent days (2026-08-31 - 2026-10-22)

Concentrations of all available pollutants for this city.

PM2.5Lowest 7.85 2026-10-22Highest 43.75 2026-10-172026-08-31 - 2026-10-22

Scroll the chart or table sideways to see the full period.

Nantou · daily averages · µg/m³
Pollutant	2026-10-22	2026-10-21	2026-10-20	2026-10-19	2026-10-18	2026-10-17	2026-10-16	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	7.85	33.9	41.7	37.68	40.69	43.75	41.11	33.84	27.55	37.59	34.86	18.45	20.35	19.15	21.17
PM10	9.52	34.88	42.33	38.13	41.6	44.4	43.84	37.43	31.1	40.03	35.11	18.6	20.67	19.32	21.2
O₃	50.92	32.67	43.25	56.92	56.29	54.71	67.63	72.25	64.88	52.13	53.25	18.83	17	12.33	29.88
NO₂	22.99	47.55	54.9	46.99	39.39	51.64	54.62	51.6	40.61	52.08	62.48	51.08	51.68	49.44	40.28
SO₂	9.64	27.77	53.68	55.63	52.53	52.43	39.57	30.38	19.04	38.73	54.47	25.06	21.9	23.03	25.33
CO	338.29	464.17	530.71	454.38	467.25	513.63	591.38	382.83	281.08	387.46	480.67	446.17	435.5	431.92	365.38

A dot on the chart and a dash in the table indicate missing data. The latest day may be incomplete.

How should I interpret the data and averaging period? →

Open-Meteo / CAMS ↗

AIR QUALITY ARCHIVE · Nantou

Nantou - air pollution history (2016-12 - 2020-05)

Compare monthly particle and gas concentrations in the available archive.

PM2.5Lowest 6.93 2019-06Highest 37.6 2017-032016-12 - 2020-05

Scroll the chart or table sideways to see the full period.

Nantou · monthly averages · units shown beside each pollutant
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	14.5	23.5	25.6	25.6	25	18.8	21.3	25.7	19.2	13.9	11.3	6.93	15.3	26	27.7	27.8	24.8	—	—	—	—	—	—	—	—	—	—	27.4	28.3	32.5	25	23.1	26.5	—	—	9.03	22.3	30.3	37.6	32.3	31.9	35.1
PM10 µg/m³	28.6	42	46.4	45.2	42.7	35.3	42.6	45.7	33.9	26.6	24.4	16.9	33.9	44.9	50.5	54.6	51.5	—	—	—	—	—	—	—	—	—	—	55.9	55.6	62.3	54.9	51.4	51.7	—	—	26.1	47.1	55.3	66.5	63.5	61.4	65.1
O₃ (ppm)	0.03	0.0372	0.0328	0.0288	0.0254	0.0204	0.0286	0.0332	0.0332	0.0258	0.0195	0.0164	0.0193	0.0214	0.022	0.0205	0.0184	—	—	—	—	—	—	—	—	—	—	0.0186	0.0157	0.0196	0.0225	0.0284	0.0317	—	—	0.0206	0.027	0.0288	0.0277	0.0242	0.0206	0.0182
NO₂ (ppm)	0.00942	0.0152	0.0154	0.0157	0.0173	0.0179	0.0162	0.0145	0.0115	0.0081	0.00721	0.0076	0.0141	0.0132	0.0177	0.0175	0.0203	—	—	—	—	—	—	—	—	—	—	0.0204	0.0219	0.021	0.0186	0.0153	0.0139	—	—	0.00793	0.0138	0.0157	0.0197	0.0185	0.0189	0.02
SO₂ (ppm)	0.00233	0.00203	0.00184	0.00193	0.00177	0.00187	0.00203	0.00216	0.0021	0.00213	0.00196	0.00176	0.00205	0.0019	0.00213	0.00214	0.00203	—	—	—	—	—	—	—	—	—	—	0.00224	0.00217	0.00243	0.00227	0.00232	0.00279	—	—	0.00186	0.00226	0.00227	0.00369	0.00229	0.0021	0.00218
CO (ppm)	0.281	0.465	0.478	0.473	0.558	0.494	0.426	0.425	0.345	0.286	0.237	0.254	0.433	0.399	0.516	0.525	0.548	—	—	—	—	—	—	—	—	—	—	0.467	0.531	0.536	0.465	0.427	0.389	—	—	0.267	0.405	0.452	0.52	0.498	0.523	0.574

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 ↗

Historical data by station 1

AIR QUALITY ARCHIVE · Nantou

Nantou

Station code: Nantou

Monthly monitoring station data.

PM2.5Lowest 6.93 2019-06Highest 37.6 2017-032016-12 - 2020-05

Scroll the chart or table sideways to see the full period.

Nantou · monthly averages · units shown beside each pollutant
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	14.5	23.5	25.6	25.6	25	18.8	21.3	25.7	19.2	13.9	11.3	6.93	15.3	26	27.7	27.8	24.8	—	—	—	—	—	—	—	—	—	—	27.4	28.3	32.5	25	23.1	26.5	—	—	9.03	22.3	30.3	37.6	32.3	31.9	35.1
PM10 µg/m³	28.6	42	46.4	45.2	42.7	35.3	42.6	45.7	33.9	26.6	24.4	16.9	33.9	44.9	50.5	54.6	51.5	—	—	—	—	—	—	—	—	—	—	55.9	55.6	62.3	54.9	51.4	51.7	—	—	26.1	47.1	55.3	66.5	63.5	61.4	65.1
O₃ (ppm)	0.03	0.0372	0.0328	0.0288	0.0254	0.0204	0.0286	0.0332	0.0332	0.0258	0.0195	0.0164	0.0193	0.0214	0.022	0.0205	0.0184	—	—	—	—	—	—	—	—	—	—	0.0186	0.0157	0.0196	0.0225	0.0284	0.0317	—	—	0.0206	0.027	0.0288	0.0277	0.0242	0.0206	0.0182
NO₂ (ppm)	0.00942	0.0152	0.0154	0.0157	0.0173	0.0179	0.0162	0.0145	0.0115	0.0081	0.00721	0.0076	0.0141	0.0132	0.0177	0.0175	0.0203	—	—	—	—	—	—	—	—	—	—	0.0204	0.0219	0.021	0.0186	0.0153	0.0139	—	—	0.00793	0.0138	0.0157	0.0197	0.0185	0.0189	0.02
SO₂ (ppm)	0.00233	0.00203	0.00184	0.00193	0.00177	0.00187	0.00203	0.00216	0.0021	0.00213	0.00196	0.00176	0.00205	0.0019	0.00213	0.00214	0.00203	—	—	—	—	—	—	—	—	—	—	0.00224	0.00217	0.00243	0.00227	0.00232	0.00279	—	—	0.00186	0.00226	0.00227	0.00369	0.00229	0.0021	0.00218
CO (ppm)	0.281	0.465	0.478	0.473	0.558	0.494	0.426	0.425	0.345	0.286	0.237	0.254	0.433	0.399	0.516	0.525	0.548	—	—	—	—	—	—	—	—	—	—	0.467	0.531	0.536	0.465	0.427	0.389	—	—	0.267	0.405	0.452	0.52	0.498	0.523	0.574

PM109.5

µg/m³

PM2.5 · Fair

NO₂ 26.8O₃ 50

October 23, 202609:00

Taiwan · air quality in other cities

Taipei Kaohsiung City Taichung City Tainan Hsinchu Taoyuan Keelung Hualian Taitung City Douliu

WEATHER & SURROUNDINGS

Taiwan · weather forecast

Daily maximum and minimum temperatures. Forecast point: 23.6978, 120.9605. Forecast for a country reference point; conditions in the city may differ.

Scroll the forecast to see the following days.

Taiwan · October 21, 2026: minimum temperature 7.9°C, maximum 16.8°C. Wind: 15 km/h. Humidity: 50%.

Full forecast: temperature, rainfall, wind and humidity

Date	Day °C	Min °C	Max °C	Night °C	Rain mm	Wind m/s	Humidity %	Clouds %
2026-10-21	14.5	7.9	16.8	9.7	0.5	4.2	50	2
2026-10-22	12.1	6.8	15	11.9	0.2	3.9	54	75
2026-10-23	11	7.7	12.1	11.3	12.2	3.1	80	100
2026-10-24	10.5	8.7	11.5	8.8	138.9	4.3	100	100
2026-10-25	12.2	8.5	13.3	8.5	24	2.1	89	100
2026-10-26	15	6.7	15	9.2	1.5	3.3	60	13
2026-10-27	14.3	6.7	14.3	6.7	2.2	3.1	72	46
2026-10-28	14.2	5.4	14.2	6.2	0.3	2.9	55	100
2026-10-29	13.2	5.2	13.2	7.1	0.3	3.6	60	1
2026-10-30	14.8	6.6	14.8	8.6	0.5	3.2	56	8
2026-10-31	16	7.1	16	7.3	1.4	3.3	54	1
2026-11-01	15.9	6.5	15.9	7.5	2.1	3.3	52	20
2026-11-02	14.2	6.7	14.2	8	2.7	3.6	65	4
2026-11-03	13.9	5.5	13.9	5.5	3	2.5	61	14
2026-11-04	13.1	4.9	13.1	5.8	1.4	3.7	61	5
2026-11-05	14.4	5.5	14.4	6.4	0.5	3.2	54	15
2026-11-06	15.3	6	15.3	7.8	0.9	2.8	51	—

UV index by day · Taiwan

Data for a country reference point. Local conditions may differ.

SPF 30-50, hat and sunglasses are a must. Better to stay in the shade 11:00-15:00.

0-2 low3-5 moderate6-7 high8-10 very high11+ extreme

Scroll the forecast to see the following days.

Taiwan · October 22, 2026: UV index: 7 .

Indicator	2026-10-22	2026-10-23	2026-10-24	2026-10-25	2026-10-26	2026-10-27	2026-10-28	2026-10-29	2026-10-30	2026-10-31	2026-11-01	2026-11-02	2026-11-03	2026-11-04	2026-11-05	2026-11-06
UV index	7	0.7	1	5.9	7.5	6.1	7.2	7.6	7.9	7	5.8	4.4	4.1	6.3	6.4	—

Open-Meteo ↗

AIR QUALITY QUESTIONS

Nantou · air pollution - questions and answers

What do the latest air quality data show for Nantou?

When was PM2.5 highest in Nantou over the past week?

The highest available daily mean PM2.5 was 43.8 µg/m³ (October 17, 2026). This comparison covers 7 days with data in the seven days before October 23, 2026. The day of the latest reading is excluded because it may be incomplete.

What period does the pollution history for Nantou 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 Nantou 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 Nantou?

For October 22, 2026, the forecast UV index is 7. The UV section also shows the following available days. The forecast is for a country reference point (Taiwan), not the city itself.

What wind speed is forecast for Nantou?

For October 21, 2026, forecast wind speed is 15 km/h. The weather table includes wind, temperature and other available parameters for subsequent days. These data describe a country reference point (Taiwan); local wind may differ.

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.

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