CAMS model • Open-Meteo

KeelungAir 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.

Keelung - latest available concentrations (September 27, 2026, 09:00 local time): PM2.5: 30 µg/m³, PM10: 32.4 µg/m³, O₃: 81 µg/m³, NO₂: 52.3 µg/m³, SO₂: 53 µg/m³, CO: 386 µg/m³. These are hourly CAMS model values for a point representing the city.

Air quality questions →

Keelung · Air pollutant concentrations

Data time: September 27, 2026 · 09:00 · local time

PM2.5

Fine particles

30µg/m³Moderate · 1 hour

PM10

Particulate matter

32.4µg/m³Fair · 1 hour

O₃

Ozone

81µg/m³Fair · 1 hour

NO₂

Nitrogen dioxide

52.3µg/m³Moderate · 1 hour

SO₂

Sulphur dioxide

53µg/m³Moderate · 1 hour

Carbon monoxide

386µg/m³

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

DAILY DATA · Keelung

Keelung - air pollution over recent days (2026-08-31 - 2026-09-26)

Concentrations of all available pollutants for this city.

PM2.5Lowest 8.56 2026-08-31Highest 32.7 2026-09-072026-08-31 - 2026-09-26

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

Keelung · daily averages · µg/m³
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	29.05	16.9	13.86	14.22	15.15	20.6	20.05	32.7	17.65	20.27	25	10.44	12.43	12.15	8.56
PM10	32.17	22.06	19.64	20.08	21.33	27.69	26.1	40.7	23.6	25.87	27.67	13.01	14.49	14.39	10.19
O₃	63.13	70.29	88.71	97.17	107.29	102.54	82.21	102.17	78.29	75.13	31.63	71.54	54.58	51.79	57
NO₂	37.4	23	14.43	14.35	16.08	22.81	24.67	33.4	26.09	31.5	29.8	16.66	25.16	23.75	17.58
SO₂	39.78	15.91	11.03	10.52	11.38	13.2	13.98	22.97	10.9	14.42	24.11	9.12	17.38	12.68	8.44
CO	602.71	257.29	210.21	211.46	229.58	221.29	233.75	364.92	226	415.29	764.79	277.83	245.79	295.38	183.29

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 · Keelung

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

Compare monthly particle and gas concentrations in the available archive.

PM2.5Lowest 7.62 2019-09Highest 21 2017-042016-12 - 2020-05

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

Keelung · 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	14.4	15.1	15.1	14.5	15.3	10.9	12.9	15.6	7.62	9.24	9.54	10.4	12.8	15.1	16	12.2	13.1	—	—	—	—	—	—	—	—	—	—	19.3	11.7	14.7	11	13.8	18.1	—	—	15.1	15.2	21	19	18.4	15.9	14.8
PM10 µg/m³	24.6	28.5	29.7	28.4	27.6	25.7	34.2	35.8	25.6	22.4	21.7	20.4	31.1	31.9	36.1	30.2	31.7	—	—	—	—	—	—	—	—	—	—	35.6	21.6	27.4	20.3	27.3	26	—	—	22.3	24.4	30.8	30.1	28.6	24.9	25.5
O₃ (ppm)	0.0313	0.0428	0.0373	0.0352	0.0319	0.0337	0.0381	0.0414	0.0268	0.0212	0.0195	0.0243	0.0422	0.0347	0.0429	0.0347	0.0327	—	—	—	—	—	—	—	—	—	—	0.0346	0.0341	0.036	0.0319	0.0385	0.0348	—	—	0.0264	0.0359	0.0377	0.0398	0.0371	0.0329	0.0343
NO₂ (ppm)	0.00883	0.01	0.011	0.0104	0.0118	0.00945	0.00907	0.01	0.00772	0.00597	0.00787	0.0112	0.00832	0.0126	0.0112	0.0101	0.0122	—	—	—	—	—	—	—	—	—	—	0.0131	0.0101	0.00877	0.00953	0.005	0.0113	—	—	0.0121	0.0101	0.0148	0.0153	0.0109	0.0103	0.008
SO₂ (ppm)	0.00175	0.00157	0.00145	0.00155	0.00177	0.00155	0.00167	0.00184	0.0016	0.00165	0.00194	0.00203	0.00136	0.00197	0.00152	0.00146	0.00152	—	—	—	—	—	—	—	—	—	—	0.00255	0.00197	0.00187	0.00177	0.00174	0.00279	—	—	0.003	0.00203	0.00253	0.003	0.002	0.00197	0.00173
CO (ppm)	0.306	0.36	0.365	0.362	0.42	0.306	0.346	0.406	0.263	0.197	0.22	0.288	0.272	0.387	0.38	0.385	0.42	—	—	—	—	—	—	—	—	—	—	0.436	0.33	0.318	0.287	0.199	0.287	—	—	0.3	0.303	0.432	0.418	0.374	0.362	0.341

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 · Keelung

Keelung

Station code: Keelung

Monthly monitoring station data.

PM2.5Lowest 7.62 2019-09Highest 21 2017-042016-12 - 2020-05

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

Keelung · 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	14.4	15.1	15.1	14.5	15.3	10.9	12.9	15.6	7.62	9.24	9.54	10.4	12.8	15.1	16	12.2	13.1	—	—	—	—	—	—	—	—	—	—	19.3	11.7	14.7	11	13.8	18.1	—	—	15.1	15.2	21	19	18.4	15.9	14.8
PM10 µg/m³	24.6	28.5	29.7	28.4	27.6	25.7	34.2	35.8	25.6	22.4	21.7	20.4	31.1	31.9	36.1	30.2	31.7	—	—	—	—	—	—	—	—	—	—	35.6	21.6	27.4	20.3	27.3	26	—	—	22.3	24.4	30.8	30.1	28.6	24.9	25.5
O₃ (ppm)	0.0313	0.0428	0.0373	0.0352	0.0319	0.0337	0.0381	0.0414	0.0268	0.0212	0.0195	0.0243	0.0422	0.0347	0.0429	0.0347	0.0327	—	—	—	—	—	—	—	—	—	—	0.0346	0.0341	0.036	0.0319	0.0385	0.0348	—	—	0.0264	0.0359	0.0377	0.0398	0.0371	0.0329	0.0343
NO₂ (ppm)	0.00883	0.01	0.011	0.0104	0.0118	0.00945	0.00907	0.01	0.00772	0.00597	0.00787	0.0112	0.00832	0.0126	0.0112	0.0101	0.0122	—	—	—	—	—	—	—	—	—	—	0.0131	0.0101	0.00877	0.00953	0.005	0.0113	—	—	0.0121	0.0101	0.0148	0.0153	0.0109	0.0103	0.008
SO₂ (ppm)	0.00175	0.00157	0.00145	0.00155	0.00177	0.00155	0.00167	0.00184	0.0016	0.00165	0.00194	0.00203	0.00136	0.00197	0.00152	0.00146	0.00152	—	—	—	—	—	—	—	—	—	—	0.00255	0.00197	0.00187	0.00177	0.00174	0.00279	—	—	0.003	0.00203	0.00253	0.003	0.002	0.00197	0.00173
CO (ppm)	0.306	0.36	0.365	0.362	0.42	0.306	0.346	0.406	0.263	0.197	0.22	0.288	0.272	0.387	0.38	0.385	0.42	—	—	—	—	—	—	—	—	—	—	0.436	0.33	0.318	0.287	0.199	0.287	—	—	0.3	0.303	0.432	0.418	0.374	0.362	0.341

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 · Keelung

Archived ratings of the local environment: green spaces, cleanliness, noise and water quality. Opinion indicators are separate from pollutant concentration measurements.

Indicator	Keelung	Hong Kong	Macau	Mexico	Philippines	South Korea
Green and Parks in the City	38%	52%	—	56%	45%	61%
particulate matter PM2.5 (µg/m³)	20	—	—	—	—	—
Pleasure of spending time in the city	46%	43%	—	57%	39%	43%
particulate matter PM10 (µg/m³)	30	—	—	—	—	—
Air Pollution	53%	67%	—	53%	64%	69%
Garbage Disposal	75%	52%	—	52%	35%	62%
Availability and quality of drinking water	44%	66%	—	57%	54%	72%
Cleanliness and tidiness	50%	54%	—	45%	38%	63%
Noise and Light pollution	44%	66%	—	48%	60%	50%
Water Pollution	75%	53%	—	55%	74%	38%

NO₂ 13.7O₃ 108

September 27, 202609:00

Taiwan · air quality in other cities

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

WEATHER & SURROUNDINGS

Keelung · weather forecast

Daily maximum and minimum temperatures. Forecast point: 25.1283, 121.7419.

Scroll the forecast to see the following days.

Keelung · September 25, 2026: minimum temperature 25.1°C, maximum 31.1°C. Wind: 16 km/h. Humidity: 56%.

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	31.1	25.1	31.1	26.5	0.6	4.5	56	8
2026-09-26	31	25.8	31.1	27.8	0.3	4.5	76	18
2026-09-27	30	25.6	31.6	27.8	3.1	5.9	59	21
2026-09-28	31.2	24.5	32.4	26.1	0.7	2.4	54	2
2026-09-29	31	25.1	31	25.6	5.8	2.6	60	2
2026-09-30	30.2	25	30.2	25.6	0.1	3.2	60	100
2026-10-01	27.8	24.5	27.8	24.5	3.4	5.1	77	48
2026-10-02	23.8	23.5	24.2	23.5	3.8	7	85	100
2026-10-03	23.7	23	24	23.2	3.7	5.8	88	100
2026-10-04	24.1	23.3	24.5	24.2	1.6	4.5	82	100
2026-10-05	24.7	23.2	24.7	23.2	17.4	7.7	90	90
2026-10-06	22.8	21.8	22.8	21.8	5	7.3	82	100
2026-10-07	22.1	20.6	22.1	20.6	7.2	9.3	77	100
2026-10-08	21.6	19.9	21.6	20.4	6.4	9.6	70	100
2026-10-09	20.8	19.9	21.8	21.3	8.4	7.1	82	99
2026-10-10	21.9	21	22.5	21	8.3	6.3	77	100
2026-10-11	23	21.5	23.3	22.1	5.4	5.9	75	94

UV index by day · Keelung

City data.

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.

Keelung · September 26, 2026: UV index: 7.9 .

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	7.9	7.8	7.8	7.8	7.8	7.5	0.9	1	2	1.9	1.6	2	2.3	3.5	3.4	—

Open-Meteo ↗

AIR QUALITY QUESTIONS

Keelung · air pollution - questions and answers

What do the latest air quality data show for Keelung?

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

The highest available daily mean PM2.5 was 29.1 µg/m³ (September 26, 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 Keelung 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 Keelung 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 Keelung?

For September 26, 2026, the forecast UV index is 7.9. The UV section also shows the following available days.

What wind speed is forecast for Keelung?

For September 25, 2026, forecast wind speed is 16 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.

Open-Meteo / CAMS ↗NASA POWER ↗