Fine particles
34.9µg/m³CAMS model • Open-Meteo
Hong KongAir quality, PM2.5 and PM10
Compare air quality across cities in this country. Explore PM2.5, PM10 and other pollutant concentrations, check data timestamps, and view recent trends and historical charts.
Hong Kong - average concentrations across available points: PM2.5: 34.9 µg/m³, PM10: 42.5 µg/m³, O₃: 40 µg/m³, NO₂: 69.1 µg/m³, SO₂: 113.3 µg/m³, CO: 552 µg/m³. Date range: September 26, 2026. Each point contributes its latest available hourly value; this is not a daily or population-weighted average.
All 2 cities with data from September 26, 2026 have the same PM2.5 concentration: 34.9 µg/m³.
Air quality questions →
2 weather warnings in effect for Hong Kong
All cities · Hong Kong
2 citiesPM2.5 vs PM10 - what is the difference? → · Models and monitoring stations →
AVERAGE ACROSS AVAILABLE COUNTRY POINTS
Latest concentrations · Hong Kong
Particulate matter
42.5µg/m³Ozone
40µg/m³Nitrogen dioxide
69.1µg/m³Sulphur dioxide
113.3µg/m³Carbon monoxide
552µg/m³Average of the latest available hour at each model point. This is neither a population-weighted nor a daily average.
DAILY DATA · Hong Kong
Hong Kong - air pollution over recent days (2026-08-31 - 2026-09-25)
Averages across available points in the country. These are not population-weighted averages.
PM2.5Lowest 18.58 2026-09-03Highest 93.16 2026-09-052026-08-31 - 2026-09-25
PM10Lowest 18.66 2026-09-03Highest 94.03 2026-09-052026-08-31 - 2026-09-25
O₃Lowest 42.83 2026-09-04Highest 94.46 2026-09-072026-08-31 - 2026-09-25
NO₂Lowest 43.07 2026-09-02Highest 94.43 2026-09-052026-08-31 - 2026-09-25
SO₂Lowest 22.2 2026-09-02Highest 76.08 2026-09-072026-08-31 - 2026-09-25
COLowest 270.21 2026-09-24Highest 750.73 2026-08-312026-08-31 - 2026-09-25
Scroll the chart or table sideways to see the full period.
| Pollutant | 2026-09-25 | 2026-09-24 | 2026-09-23 | 2026-09-22 | 2026-09-21 | 2026-09-20 | 2026-09-19 | 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 | 34.59 | 32.11 | 37.03 | 63.71 | 59.52 | 47.53 | 33.73 | 67.82 | 45.13 | 93.16 | 39.76 | 18.58 | 20.36 | 18.9 | 38.01 |
| PM10 | 41.91 | 39.64 | 42.65 | 64.19 | 61.07 | 51.63 | 37.2 | 68.39 | 45.67 | 94.03 | 40.09 | 18.66 | 20.47 | 19.39 | 38.18 |
| O₃ | 63.75 | 75.63 | 73.46 | 52.71 | 73.46 | 80.96 | 78 | 94.46 | 46.63 | 49.54 | 42.83 | 52.58 | 65.63 | 49.92 | 46.88 |
| NO₂ | 66.7 | 59.38 | 69.48 | 90.91 | 84.95 | 75.29 | 69.98 | 93.95 | 85.84 | 94.43 | 62.54 | 47.36 | 43.07 | 45.83 | 65.89 |
| SO₂ | 49.76 | 43.79 | 44.57 | 53.96 | 64.45 | 54.6 | 44.14 | 76.08 | 70.25 | 68.13 | 43.03 | 24.46 | 22.2 | 25.78 | 38.5 |
| CO | 316.29 | 270.21 | 359.63 | 463.06 | 604.65 | 395.13 | 364.56 | 606.6 | 699.23 | 683.69 | 579.29 | 518.19 | 456.79 | 405.88 | 750.73 |
A dot on the chart and a dash in the table indicate missing data. The latest day may be incomplete.
AIR QUALITY ARCHIVE · Hong Kong
Hong Kong - air pollution history (2018-01 - 2020-05)
Compare monthly particle and gas concentrations in the available archive.
PM2.5Lowest 8.91 2020-05Highest 29.3 2019-012018-01 - 2020-05
PM10Lowest 16 2019-06Highest 48.5 2019-112018-01 - 2020-05
O₃Lowest 26.7 2019-06Highest 95.9 2019-102018-01 - 2020-05
NO₂Lowest 26.7 2020-05Highest 57.2 2019-012018-01 - 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 | 8.91 | 15.6 | 17.5 | 16.5 | 20.5 | 25.1 | 25.5 | 25.5 | 19.1 | 11.9 | 10.2 | 9.03 | 14.9 | 16.4 | 18.3 | 18 | 29.3 | 22 | 21.7 | 22.8 | 17.5 | 11.6 | 9.61 | 12.3 | 11 | 24.1 | 22.4 | 28 | 20.5 |
| PM10 | 16.6 | 28.2 | 30.8 | 28.5 | 33.5 | 43.9 | 48.5 | 43.3 | 31.5 | 21.3 | 20.8 | 16 | 27.1 | 24.6 | 29.7 | 28.1 | 45.8 | 35.3 | 35.4 | 40.2 | 29 | 20 | 18.1 | 21 | 17.6 | 41.7 | 38 | 44.1 | 36.5 |
| O₃ | 28.6 | 59.9 | 50.2 | 45.2 | 51.6 | 59.6 | 87.7 | 95.9 | 82.4 | 44.6 | 31.9 | 26.7 | 55.2 | 48.6 | 44.7 | 41.6 | 46.3 | 29.1 | 58.4 | 81.8 | 43 | 39.3 | 27.6 | 38.1 | 30.1 | 51 | 58.1 | 42 | 42.4 |
| NO₂ | 26.7 | 39.7 | 38.2 | 38.7 | 43.3 | 52.4 | 47.4 | 43.6 | 38.4 | 37.7 | 27.8 | 34 | 36.1 | 35.3 | 44.5 | 42 | 57.2 | 45.8 | 42.8 | 46.8 | 41 | 39.9 | 27 | 33 | 30.9 | 42.5 | 46.3 | 54.1 | 43.7 |
A dot on the chart and a dash in the table indicate missing data. Historical values do not describe today’s air quality.
Environment and quality of life ratings · Hong Kong
Archived ratings of the local environment: green spaces, cleanliness, noise and water quality. Opinion indicators are separate from pollutant concentration measurements.
| Indicator | Hong Kong | Macau | Taiwan | Mexico | laoPDR | Vietnam |
|---|---|---|---|---|---|---|
| Green and Parks in the City | 52% | — | 53% | 56% | 37% | 42% |
| Pleasure of spending time in the city | 43% | — | 47% | 57% | 38% | 30% |
| Air Pollution | 67% | — | 61% | 53% | 72% | 78% |
| Garbage Disposal | 52% | — | 65% | 52% | 20% | 24% |
| Availability and quality of drinking water | 66% | — | 54% | 57% | 51% | 43% |
| Cleanliness and tidiness | 54% | — | 56% | 45% | 32% | 29% |
| Noise and Light pollution | 66% | — | 59% | 48% | 55% | 65% |
| Water Pollution | 53% | — | 58% | 55% | 73% | 73% |
WEATHER & SURROUNDINGS
Hong Kong · weather forecast
Daily maximum and minimum temperatures. Forecast point: 22.267, 114.188.
Scroll the forecast to see the following days.
Hong Kong · September 23, 2026: minimum temperature 26.4°C, maximum 30°C. Wind: 24.6 km/h. Humidity: 73%.
Full forecast: temperature, rainfall, wind and humidity
| Date | Day °C | Min °C | Max °C | Night °C | Rain mm | Wind m/s | Humidity % | Clouds % |
|---|---|---|---|---|---|---|---|---|
| 2026-09-23 | 28.9 | 26.4 | 30 | 26.4 | 1.9 | 6.8 | 73 | 23 |
| 2026-09-24 | 30.1 | 26.4 | 31.9 | 27.1 | 0.2 | 6.4 | 67 | 51 |
| 2026-09-25 | 29.7 | 26.3 | 31.1 | 26.9 | 0.2 | 5.8 | 68 | 27 |
| 2026-09-26 | 30.5 | 25.4 | 32.1 | 27 | 2.1 | 4.3 | 70 | 15 |
| 2026-09-27 | 28 | 26.4 | 28.3 | 27 | 0.2 | 4.9 | 66 | 19 |
| 2026-09-28 | 28.1 | 26.7 | 28.5 | 27.3 | 0.6 | 4.9 | 77 | 20 |
| 2026-09-29 | 28.3 | 26.9 | 28.7 | 27.2 | 0.1 | 4.7 | 77 | 15 |
| 2026-09-30 | 28.2 | 26.8 | 28.6 | 27.3 | 0.3 | 4.9 | 78 | 11 |
| 2026-10-01 | 28.4 | 26.8 | 28.7 | 27.4 | 0.4 | 4.6 | 78 | 26 |
| 2026-10-02 | 26.7 | 26.2 | 27 | 26.2 | 6.4 | 5.3 | 80 | 41 |
| 2026-10-03 | 26.1 | 25.6 | 26.3 | 25.8 | 9.7 | 6.4 | 83 | 85 |
| 2026-10-04 | 24.3 | 24.3 | 25.4 | 25.3 | 11.3 | 7.7 | 90 | 100 |
| 2026-10-05 | 25.7 | 24.9 | 25.7 | 25.3 | 0.6 | 8 | 72 | 78 |
| 2026-10-06 | 26.4 | 25.1 | 26.4 | 25.5 | 0.5 | 9.6 | 64 | 87 |
| 2026-10-07 | 25.7 | 24.8 | 25.8 | 25.6 | 1.8 | 10.1 | 62 | 20 |
| 2026-10-08 | 25.7 | 25 | 25.7 | 25.5 | 0.1 | 8.4 | 63 | 6 |
| 2026-10-09 | 25.7 | 24.9 | 25.7 | 25.1 | — | 7.1 | 68 | 68 |
| 2026-10-10 | 26.7 | 24.8 | 26.8 | 25.8 | 0.1 | 2.9 | 64 | 13 |
UV index by day · Hong Kong
Data for a country reference point. Local conditions may differ.
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.
Hong Kong · September 25, 2026: UV index: 8 .
| Indicator | 2026-09-25 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index | 8 | 8 | 8 | 8 | 8 | 8 | 7.9 | 7 | 6.2 | 2.4 | 4.8 | 8.2 | 7.7 | 7.5 | 4.9 | — |
Sea temperature and waves · Hong Kong
Data for a selected coastal point.
Scroll the forecast to see the following days.
Hong Kong · September 25, 2026: Sea temperature (°C): 29.4 . Wave height (m): 0.3 .
| Indicator | 2026-09-25 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 29.4 | 29.6 | 29.7 | 29.9 | 30 | 30 | 29.9 | 29.9 | 29.9 | — | — | — | — | — | — | — |
| Wave height (m) | 0.3 | 0.2 | 0.3 | 0.4 | 0.3 | 0.3 | 0.1 | 0.1 | 0.1 | — | — | — | — | — | — | — |
Sea temperature throughout the year · Hong Kong
Monthly climate values for a selected coastal area (°C).
18.4°Jan
18.8°Feb
20.5°Mar
24.1°Apr
26.7°May
28.6°Jun
29.4°Jul
28.7°Aug
28.7°Sep
27.8°Oct
24.7°Nov
21.1°Dec
| °C | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea | 18.4 | 18.8 | 20.5 | 24.1 | 26.7 | 28.6 | 29.4 | 28.7 | 28.7 | 27.8 | 24.7 | 21.1 |
AIR QUALITY QUESTIONS
Hong Kong · air pollution - questions and answers
What do the latest air quality data show for Hong Kong?
Hong Kong - average concentrations across available points: PM2.5: 34.9 µg/m³, PM10: 42.5 µg/m³, O₃: 40 µg/m³, NO₂: 69.1 µg/m³, SO₂: 113.3 µg/m³, CO: 552 µg/m³. Date range: September 26, 2026. Each point contributes its latest available hourly value; this is not a daily or population-weighted average.
When was PM2.5 highest in Hong Kong over the past week?
The highest available daily mean PM2.5 was 63.7 µg/m³ (September 22, 2026). This comparison covers 7 days with data in the seven days before September 26, 2026. The day of the latest reading is excluded because it may be incomplete.
Which cities in Hong Kong have the cleanest and most polluted air by PM2.5?
All 2 cities with data from September 26, 2026 have the same PM2.5 concentration: 34.9 µg/m³.
What period does the pollution history for Hong Kong cover?
Available monthly means cover 2018-01 - 2020-05. The tables include PM2.5, PM10, O₃, NO₂. 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 Hong Kong 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 Hong Kong?
For September 25, 2026, the forecast UV index is 8. The UV section also shows the following available days.
What wind speed is forecast for Hong Kong?
For September 23, 2026, forecast wind speed is 24.6 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.