United States · The summary is refreshed every 15 minutes.
October 22
The air is moderate now
Houston
24°C
Clear
59AQI
1022hPa
Atmospheric
pressure
54%
Humidity
Houston, October 21, 2026: daily mean PM2.5 13 µg/m³ (9 sensors), level “Moderate” — as in the Atmy Data Hub. Now (13:00 local time): 13.3 µg/m³. Open methodology and data in JSON: Methodology and data sources · JSON
Right now in Houston, PM2.5 averages 13.3 µg/m³ — “moderate” on the US EPA scale (approximate, from hourly readings). Mean of 9 sensors on the Atmy network, readings from 12:47–12:47 local time (17:47–17:47 UTC), summary prepared at 13:00 local time. Median: 12.8 µg/m³; range across sensors: 7.5–17.8 µg/m³.
In Houston the air is moderate right now (approximate, US EPA scale). From 00:00 to 13:00 local time the city mean PM2.5 stayed roughly level: from 14.0 to 13.3 µg/m³. The highest hour was 08:00 with 40.8 µg/m³.
The wind is weak (2 m/s): particles are likely accumulating near the ground.
Weather now: clear, 24°C, wind 2 m/s, humidity 54%. No major change in the wind is expected in the coming hours. By 00:00 the temperature will be about 18°C.
Written automatically at 13:00 local time (18:00 UTC) from sensor measurements and the weather forecast. Values are approximate; hypotheses are marked.
7 km/h
Wind, NNE
0 mm
Precipitation today
13 µg/m³ Moderate
Daily mean PM2.5 on October 21, 2026 (00:00–24:00 UTC): 13 µg/m³ from 9 sensors that passed the quality check — the same value as in the Atmy Data Hub.
Monthly means of quality-checked sensors, as in the Data Hub trend; the current month is still incomplete, “-” means no data.
8%An estimate of weather conditions · not a PM2.5 forecast
29°/17°
Index by time of day
61/100Moderate
Night
Morning
Day
Evening29°/14°
Index by time of day
53/100Moderate
NightMorningDayEvening29°/15°
Index by time of day
59/100Moderate
NightMorningDayEvening27°/21°
Index by time of day
50/100Moderate
NightMorningDayEvening28°/20°
Index by time of day
55/100Moderate
NightMorningDayEvening27°/21°
Index by time of day
46/100Moderate
NightMorningDayEveningForecast of conditions that trap pollution near the surface
24°
Clear. Feels like 25°C
19°C90%29°C28%20°C53%7km/hWind from the NNE
7km/hWind gusts
Wind force: 2
Gusts up to 14 km/h are expected.
United States
29°C17°C
29°C14°C29°C15°C27°C21°C28°C20°C27°C21°C29°C20°C28°C20°C26°C20°C
25°C22°C
Highest current reading: 17.8 µg/m³ (AAH Third Ward Bike Shop). Lowest: 7.5 µg/m³ (AAH - Paige St (EaDo)). The list shows every sensor, highest first.
Source: atmy.ai monitoring network
Sensors in the summary by network: AirGradient — 9 sensors.
Atmy shows the networks’ readings after the Data Hub’s quality check: test devices and sensors that fail it are left out.
41
BellevueUnited States
4PortlandUnited States
4RenoUnited States
3Cities with the most sensors
All sensors on the map, by city as the map assigns them; the city’s values count only the sensors that pass the Data Hub’s quality check.
Daily mean PM2.5 of the city sensors, µg/m³
Click a day to see its date and value.
A card with the current PM2.5 in Houston: it is refreshed every 15 minutes and links to this page. Paste the code into your site.
United States · City ranking · All pilot cities
Daily mean PM2.5 on October 21, 2026 (00:00–24:00 UTC): 13 µg/m³ from 9 sensors that passed the quality check — the same value as in the Atmy Data Hub.
Right now in Houston, PM2.5 averages 13.3 µg/m³ — “moderate” on the US EPA scale (approximate, from hourly readings). Mean of 9 sensors on the Atmy network, readings from 12:47–12:47 local time (17:47–17:47 UTC), summary prepared at 13:00 local time. Median: 12.8 µg/m³; range across sensors: 7.5–17.8 µg/m³.
The current level is “moderate” (US EPA scale, approximate). Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors. This is the standard guidance of the scale, not medical advice.
Highest current reading: 17.8 µg/m³ (AAH Third Ward Bike Shop). Lowest: 7.5 µg/m³ (AAH - Paige St (EaDo)). The list shows every sensor, highest first.
From Atmy sensors and connected public networks (citizen, experimental and government monitors), aggregated by Atmy. Values are approximate; see the methodology.
The summary is rebuilt every 15 minutes from the latest reading of each sensor, each no older than one hour.
Over the last 332 days with data, the mean daily PM2.5 in Houston was 7.8 µg/m³ — 1.6 times the WHO annual guideline (5 µg/m³). Over the last 30 days: 9.8 µg/m³. From Atmy's archive of daily city means.
In Atmy's daily archive, the cleanest month of the last year was July 2026: 5.0 µg/m³ on average.
The most polluted month of the last year was February 2026: 14.2 µg/m³ on average.
From November to March the mean daily PM2.5 was 9.8 µg/m³, from June to August 5.1 µg/m³ (last 365 days).
The daily value is the Data Hub’s: the mean of the city’s sensors that passed the nightly quality check, each with at least 12 valid hours, and only with sensors at four places 500 m apart; days are UTC.
“Now” uses the same sensors and rule: the mean of their latest readings, each at most 60 minutes old, shown only with sensors at four places 500 m apart reporting.
Source: public Atmy monitoring data. Methodology and data sources · Data terms
