Fine particles
11.6µg/m³Fair · 1 hourCAMS model • Open-Meteo
HoustonAir 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.
Houston - latest available concentrations (September 25, 2026, 20:00 local time): PM2.5: 11.6 µg/m³, PM10: 11.7 µg/m³, O₃: 93 µg/m³, NO₂: 12.7 µg/m³, SO₂: 3.4 µg/m³, CO: 168 µg/m³. These are hourly CAMS model values for a point representing the city.
Air quality questions →
5 weather warnings in effect for United States
Houston · Air pollutant concentrations
Data time: September 25, 2026 · 20:00 · local timeParticulate matter
11.7µg/m³Good · 1 hourOzone
93µg/m³Fair · 1 hourNitrogen dioxide
12.7µg/m³Fair · 1 hourSulphur dioxide
3.4µg/m³Good · 1 hourCarbon monoxide
168µg/m³PM2.5 vs PM10 - what is the difference? → · Models and monitoring stations →
DAILY DATA · Houston
Houston - air pollution over recent days (2026-08-30 - 2026-09-24)
Concentrations of all available pollutants for this city.
PM2.5Lowest 10.78 2026-09-03Highest 29.29 2026-09-222026-08-30 - 2026-09-24
PM10Lowest 13.58 2026-09-03Highest 32.85 2026-09-222026-08-30 - 2026-09-24
O₃Lowest 44.17 2026-09-01Highest 103.71 2026-09-232026-08-30 - 2026-09-24
NO₂Lowest 13.45 2026-08-30Highest 32.65 2026-09-012026-08-30 - 2026-09-24
SO₂Lowest 2.27 2026-09-18Highest 5.04 2026-09-052026-08-30 - 2026-09-24
COLowest 145.33 2026-09-03Highest 237.75 2026-09-232026-08-30 - 2026-09-24
Scroll the chart or table sideways to see the full period.
| Pollutant | 2026-09-24 | 2026-09-23 | 2026-09-22 | 2026-09-21 | 2026-09-20 | 2026-09-19 | 2026-09-18 | 2026-09-06 | 2026-09-05 | 2026-09-04 | 2026-09-03 | 2026-09-02 | 2026-09-01 | 2026-08-31 | 2026-08-30 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 | 20.26 | 21.6 | 29.29 | 21.34 | 19.58 | 16.29 | 12.36 | 18.06 | 24.08 | 17.66 | 10.78 | 12.51 | 19.48 | 19.35 | 15.88 |
| PM10 | 21.23 | 22.91 | 32.85 | 25.11 | 23.37 | 19.31 | 14.86 | 20.66 | 27.54 | 21.21 | 13.58 | 15.5 | 21.02 | 22.86 | 18.99 |
| O₃ | 93.88 | 103.71 | 87.58 | 79.75 | 71.38 | 81.63 | 84.63 | 73.83 | 69.79 | 62.5 | 50.5 | 52.83 | 44.17 | 88.54 | 83.71 |
| NO₂ | 24.03 | 22.94 | 25.53 | 20 | 19.33 | 18 | 13.58 | 20.47 | 24.61 | 19.6 | 14.46 | 17.25 | 32.65 | 17.74 | 13.45 |
| SO₂ | 4.01 | 4.24 | 4.67 | 4.03 | 3.4 | 2.88 | 2.27 | 4.89 | 5.04 | 3.76 | 2.69 | 2.75 | 4.55 | 4.67 | 3.67 |
| CO | 212.17 | 237.75 | 199 | 174.54 | 146.92 | 176.17 | 174.42 | 173.21 | 170 | 169.83 | 145.33 | 154.17 | 187.79 | 161.92 | 145.88 |
A dot on the chart and a dash in the table indicate missing data. The latest day may be incomplete.
Air quality in nearby cities
All cities →United States↗
Austin
PM2.56.2
PM106.2
µg/m³
PM2.5 · FairNO₂ 5O₃ 108
September 25, 202620:00
United States↗
Dallas
PM2.57.3
PM107.4
µg/m³
PM2.5 · FairNO₂ 9.9O₃ 106
September 25, 202620:00
Mexico↗
Monterrey
PM2.52.3
PM102.8
µg/m³
PM2.5 · GoodNO₂ 6.4O₃ 70
September 25, 202619:00
United States↗
San Antonio
PM2.56.7
PM107
µg/m³
PM2.5 · FairNO₂ 7.1O₃ 108
September 25, 202620:00
United States↗
Fort Worth
PM2.59.5
PM109.5
µg/m³
PM2.5 · FairNO₂ 10O₃ 136
September 25, 202620:00
United States↗
Memphis
PM2.57.1
PM107.4
µg/m³
PM2.5 · FairNO₂ 6.1O₃ 82
September 25, 202620:00
United States↗
Jacksonville
PM2.59.5
PM1011.4
µg/m³
PM2.5 · FairNO₂ 10.1O₃ 81
September 25, 202621:00
United States↗
Indianapolis
PM2.54.6
PM104.6
µg/m³
PM2.5 · GoodNO₂ 12.7O₃ 57
September 25, 202621:00
United States · air quality in other cities
WEATHER & SURROUNDINGS
Houston · weather forecast
Daily maximum and minimum temperatures. Forecast point: 29.7633, -95.3633.
Scroll the forecast to see the following days.
Houston · September 23, 2026: minimum temperature 25°C, maximum 35.5°C. Wind: 12.3 km/h. Humidity: 55%.
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 | 35 | 25 | 35.5 | 30.3 | 0.3 | 3.4 | 55 | 29 |
| 2026-09-24 | 34.2 | 24.9 | 35.2 | 30 | 0.7 | 3.2 | 57 | 14 |
| 2026-09-25 | 33.7 | 23.3 | 35.4 | 26.4 | — | 2.8 | 42 | 65 |
| 2026-09-26 | 34.5 | 24 | 34.5 | 27.4 | 5.2 | 3.5 | 48 | 100 |
| 2026-09-27 | 33.9 | 23.9 | 35 | 27.9 | 0.5 | 4 | 41 | 42 |
| 2026-09-28 | 33.2 | 25.5 | 33.2 | 27.7 | 0.8 | 3.4 | 51 | 83 |
| 2026-09-29 | 33.5 | 25.2 | 33.5 | 28 | 3.3 | 4.2 | 47 | 93 |
| 2026-09-30 | 32.5 | 26.3 | 32.5 | 28.3 | 0.2 | 6.2 | 56 | 100 |
| 2026-10-01 | 28.9 | 26.6 | 29.7 | 26.7 | 19 | 5.8 | 75 | 61 |
| 2026-10-02 | 30.1 | 25.6 | 31.8 | 27.4 | 11.7 | 4.2 | 64 | 100 |
| 2026-10-03 | 33.1 | 25.4 | 33.9 | 28.1 | 0.4 | 3.9 | 48 | 6 |
| 2026-10-04 | 33 | 26 | 34.2 | 28.5 | 0.1 | 3.7 | 49 | 45 |
| 2026-10-05 | 20.8 | 19.1 | 25.6 | 19.1 | 13.4 | 6.9 | 81 | 100 |
| 2026-10-06 | 14.3 | 13.2 | 16.7 | 14.4 | 11.2 | 6.1 | 72 | 100 |
| 2026-10-07 | 22.7 | 15.6 | 24.9 | 20.6 | 0.5 | 4.9 | 26 | 96 |
| 2026-10-08 | 25.9 | 16.8 | 27.4 | 21.6 | — | 2.4 | 26 | — |
| 2026-10-09 | 28.7 | 18.7 | 30.1 | 23.1 | — | 2.8 | 27 | — |
UV index by day · Houston
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.
Houston · September 25, 2026: UV index: 7.3 .
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index | 7.3 | 6.8 | 7.1 | 7.2 | 5.1 | 5.9 | 3 | 4.2 | 7.3 | 6.8 | 1.1 | 0.4 | 6.8 | 6.8 | 6.7 | — |
AIR QUALITY QUESTIONS
Houston · air pollution - questions and answers
What do the latest air quality data show for Houston?
Houston - latest available concentrations (September 25, 2026, 20:00 local time): PM2.5: 11.6 µg/m³, PM10: 11.7 µg/m³, O₃: 93 µg/m³, NO₂: 12.7 µg/m³, SO₂: 3.4 µg/m³, CO: 168 µg/m³. These are hourly CAMS model values for a point representing the city.
When was PM2.5 highest in Houston over the past week?
The highest available daily mean PM2.5 was 29.3 µg/m³ (September 22, 2026). This comparison covers 7 days with data in the seven days before September 25, 2026. The day of the latest reading is excluded because it may be incomplete.
Is the PM2.5 concentration for Houston 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 Houston?
For September 25, 2026, the forecast UV index is 7.3. The UV section also shows the following available days.
What wind speed is forecast for Houston?
For September 23, 2026, forecast wind speed is 12.3 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.