SmogRank / United States / Texas

Air quality in Houston

Texas, United States. PM2.5 from 7 reference monitors, updated hourly.

3.5 µg/m³
Good

Latest hour (04:00 UTC), 0.2× the WHO 24-hour guideline.

Rank

24 h
–
not enough data
7 days
#671
of 2,330 · 9.1 µg/m³
30 days
#587
of 2,327 · 8.2 µg/m³
Year
#557
of 2,160 · 10.5 µg/m³

Last 4 days, hour by hour

15302026-10-01 00:00 UTC: 5.9 µg/m³2026-10-01 01:00 UTC: 4.9 µg/m³2026-10-01 02:00 UTC: 3.6 µg/m³2026-10-01 03:00 UTC: 3.5 µg/m³2026-10-01 04:00 UTC: 3.5 µg/m³Sep 28Sep 29Sep 30Oct 1

Times in UTC. Dashed line: WHO 24-hour guideline (15 µg/m³).

Every day for a year

SepNovDecJanFebMarAprMayJunJulAugSepMonWedFri2025-09-29: 15.9 µg/m³2025-09-30: 18.8 µg/m³2025-10-01: 21.0 µg/m³2025-10-02: 20.2 µg/m³2025-10-03: 15.3 µg/m³2025-10-04: 12.4 µg/m³2025-10-05: 8.7 µg/m³2025-10-06: 9.6 µg/m³2025-10-07: 9.6 µg/m³2025-10-08: 11.9 µg/m³2025-10-09: 11.9 µg/m³2025-10-10: 12.3 µg/m³2025-10-11: 12.8 µg/m³2025-10-12: 12.0 µg/m³2025-10-13: 14.1 µg/m³2025-10-14: 19.7 µg/m³2025-10-15: 17.6 µg/m³2025-10-16: 16.8 µg/m³2025-10-17: 9.7 µg/m³2025-10-18: 6.2 µg/m³2025-10-19: 6.0 µg/m³2025-10-20: 9.4 µg/m³2025-10-21: 11.3 µg/m³2025-10-22: 10.8 µg/m³2025-10-23: 13.1 µg/m³2025-10-24: 10.3 µg/m³2025-10-25: 6.4 µg/m³2025-10-26: 7.8 µg/m³2025-10-27: 11.8 µg/m³2025-10-28: 10.7 µg/m³2025-10-29: 3.3 µg/m³2025-10-30: 7.9 µg/m³2025-10-31: 16.1 µg/m³2025-11-01: 13.1 µg/m³2025-11-02: 16.4 µg/m³2025-11-03: 14.3 µg/m³2025-11-04: 14.5 µg/m³2025-11-05: 9.9 µg/m³2025-11-06: 10.5 µg/m³2025-11-07: 8.3 µg/m³2025-11-08: 12.0 µg/m³2025-11-09: 5.8 µg/m³2025-11-10: 7.0 µg/m³2025-11-11: 12.2 µg/m³2025-11-12: 7.5 µg/m³2025-11-13: 8.5 µg/m³2025-11-14: no data2025-11-15: no data2025-11-16: no data2025-11-17: no data2025-11-18: no data2025-11-19: no data2025-11-20: no data2025-11-21: 8.5 µg/m³2025-11-22: 12.4 µg/m³2025-11-23: 8.0 µg/m³2025-11-24: 8.1 µg/m³2025-11-25: 8.8 µg/m³2025-11-26: 6.4 µg/m³2025-11-27: 9.5 µg/m³2025-11-28: 6.5 µg/m³2025-11-29: 4.9 µg/m³2025-11-30: 3.9 µg/m³2025-12-01: 5.5 µg/m³2025-12-02: 8.7 µg/m³2025-12-03: 14.0 µg/m³2025-12-04: 5.4 µg/m³2025-12-05: 17.0 µg/m³2025-12-06: 19.1 µg/m³2025-12-07: 17.2 µg/m³2025-12-08: 16.6 µg/m³2025-12-09: 17.1 µg/m³2025-12-10: 14.7 µg/m³2025-12-11: 13.4 µg/m³2025-12-12: 15.4 µg/m³2025-12-13: 8.0 µg/m³2025-12-14: 11.6 µg/m³2025-12-15: 11.9 µg/m³2025-12-16: 20.8 µg/m³2025-12-17: 11.8 µg/m³2025-12-18: 8.6 µg/m³2025-12-19: 10.1 µg/m³2025-12-20: 15.0 µg/m³2025-12-21: 10.6 µg/m³2025-12-22: 11.0 µg/m³2025-12-23: 12.3 µg/m³2025-12-24: 10.0 µg/m³2025-12-25: 7.4 µg/m³2025-12-26: 6.8 µg/m³2025-12-27: 6.6 µg/m³2025-12-28: 7.9 µg/m³2025-12-29: 3.4 µg/m³2025-12-30: 10.7 µg/m³2025-12-31: 30.9 µg/m³2026-01-01: 45.3 µg/m³2026-01-02: 5.9 µg/m³2026-01-03: 11.6 µg/m³2026-01-04: 9.6 µg/m³2026-01-05: 10.8 µg/m³2026-01-06: 19.6 µg/m³2026-01-07: 16.1 µg/m³2026-01-08: 8.9 µg/m³2026-01-09: 12.6 µg/m³2026-01-10: 4.1 µg/m³2026-01-11: 7.7 µg/m³2026-01-12: 15.3 µg/m³2026-01-13: 19.8 µg/m³2026-01-14: 5.2 µg/m³2026-01-15: 7.1 µg/m³2026-01-16: 9.7 µg/m³2026-01-17: 3.8 µg/m³2026-01-18: 10.3 µg/m³2026-01-19: 8.4 µg/m³2026-01-20: 12.9 µg/m³2026-01-21: 11.9 µg/m³2026-01-22: 8.5 µg/m³2026-01-23: 19.2 µg/m³2026-01-24: 4.7 µg/m³2026-01-25: 6.9 µg/m³2026-01-26: 8.1 µg/m³2026-01-27: 18.0 µg/m³2026-01-28: 18.9 µg/m³2026-01-29: 18.1 µg/m³2026-01-30: 17.5 µg/m³2026-01-31: 9.8 µg/m³2026-02-01: 11.0 µg/m³2026-02-02: 10.3 µg/m³2026-02-03: 6.4 µg/m³2026-02-04: 7.0 µg/m³2026-02-05: 7.7 µg/m³2026-02-06: 7.3 µg/m³2026-02-07: 14.1 µg/m³2026-02-08: 10.4 µg/m³2026-02-09: 5.9 µg/m³2026-02-10: 7.0 µg/m³2026-02-11: 10.6 µg/m³2026-02-12: 17.0 µg/m³2026-02-13: 10.5 µg/m³2026-02-14: 7.7 µg/m³2026-02-15: 3.6 µg/m³2026-02-16: 8.9 µg/m³2026-02-17: 6.4 µg/m³2026-02-18: 10.5 µg/m³2026-02-19: 24.2 µg/m³2026-02-20: 23.2 µg/m³2026-02-21: 16.8 µg/m³2026-02-22: 6.2 µg/m³2026-02-23: 12.6 µg/m³2026-02-24: 19.6 µg/m³2026-02-25: 8.3 µg/m³2026-02-26: 16.0 µg/m³2026-02-27: 16.5 µg/m³2026-02-28: 21.1 µg/m³2026-03-01: 9.1 µg/m³2026-03-02: 9.9 µg/m³2026-03-03: 9.4 µg/m³2026-03-04: 8.7 µg/m³2026-03-05: 9.1 µg/m³2026-03-06: 9.9 µg/m³2026-03-07: 9.0 µg/m³2026-03-08: 6.2 µg/m³2026-03-09: 9.5 µg/m³2026-03-10: 11.1 µg/m³2026-03-11: 8.3 µg/m³2026-03-12: 5.0 µg/m³2026-03-13: 10.8 µg/m³2026-03-14: 5.2 µg/m³2026-03-15: 8.4 µg/m³2026-03-16: 3.8 µg/m³2026-03-17: 6.0 µg/m³2026-03-18: 6.3 µg/m³2026-03-19: 7.3 µg/m³2026-03-20: 7.3 µg/m³2026-03-21: 6.1 µg/m³2026-03-22: 6.3 µg/m³2026-03-23: 8.2 µg/m³2026-03-24: 9.8 µg/m³2026-03-25: 7.5 µg/m³2026-03-26: 6.2 µg/m³2026-03-27: 7.1 µg/m³2026-03-28: 8.9 µg/m³2026-03-29: 11.6 µg/m³2026-03-30: 9.8 µg/m³2026-03-31: 10.1 µg/m³2026-04-01: 9.7 µg/m³2026-04-02: 11.1 µg/m³2026-04-03: 9.2 µg/m³2026-04-04: 7.9 µg/m³2026-04-05: 4.1 µg/m³2026-04-06: 5.7 µg/m³2026-04-07: 8.3 µg/m³2026-04-08: 9.8 µg/m³2026-04-09: 10.0 µg/m³2026-04-10: 10.1 µg/m³2026-04-11: 8.3 µg/m³2026-04-12: 7.4 µg/m³2026-04-13: 8.8 µg/m³2026-04-14: 10.0 µg/m³2026-04-15: 9.7 µg/m³2026-04-16: 10.7 µg/m³2026-04-17: 11.5 µg/m³2026-04-18: 8.7 µg/m³2026-04-19: 4.0 µg/m³2026-04-20: 7.5 µg/m³2026-04-21: 8.8 µg/m³2026-04-22: 12.4 µg/m³2026-04-23: 7.4 µg/m³2026-04-24: 12.5 µg/m³2026-04-25: 16.0 µg/m³2026-04-26: 11.2 µg/m³2026-04-27: 15.2 µg/m³2026-04-28: 14.1 µg/m³2026-04-29: 13.4 µg/m³2026-04-30: 9.1 µg/m³2026-05-01: 1.9 µg/m³2026-05-02: 6.6 µg/m³2026-05-03: 11.3 µg/m³2026-05-04: 8.0 µg/m³2026-05-05: 10.5 µg/m³2026-05-06: 21.7 µg/m³2026-05-07: 12.1 µg/m³2026-05-08: 13.8 µg/m³2026-05-09: 10.7 µg/m³2026-05-10: 10.1 µg/m³2026-05-11: 5.4 µg/m³2026-05-12: 10.1 µg/m³2026-05-13: 14.0 µg/m³2026-05-14: 11.4 µg/m³2026-05-15: 8.4 µg/m³2026-05-16: 8.1 µg/m³2026-05-17: 11.4 µg/m³2026-05-18: 12.9 µg/m³2026-05-19: 10.7 µg/m³2026-05-20: 7.2 µg/m³2026-05-21: 10.0 µg/m³2026-05-22: 8.2 µg/m³2026-05-23: 5.5 µg/m³2026-05-24: 6.5 µg/m³2026-05-25: 8.9 µg/m³2026-05-26: 6.4 µg/m³2026-05-27: 5.9 µg/m³2026-05-28: 9.6 µg/m³2026-05-29: 10.4 µg/m³2026-05-30: 8.6 µg/m³2026-05-31: 7.7 µg/m³2026-06-01: 11.3 µg/m³2026-06-02: 9.6 µg/m³2026-06-03: 6.9 µg/m³2026-06-04: 8.3 µg/m³2026-06-05: 6.0 µg/m³2026-06-06: 7.4 µg/m³2026-06-07: 14.7 µg/m³2026-06-08: 12.6 µg/m³2026-06-09: 10.1 µg/m³2026-06-10: 8.5 µg/m³2026-06-11: 8.1 µg/m³2026-06-12: 8.8 µg/m³2026-06-13: 13.7 µg/m³2026-06-14: 11.4 µg/m³2026-06-15: 10.8 µg/m³2026-06-16: 6.7 µg/m³2026-06-17: 8.2 µg/m³2026-06-18: 19.1 µg/m³2026-06-19: 13.2 µg/m³2026-06-20: 8.0 µg/m³2026-06-21: 8.2 µg/m³2026-06-22: 12.4 µg/m³2026-06-23: 15.7 µg/m³2026-06-24: 19.6 µg/m³2026-06-25: 16.1 µg/m³2026-06-26: 12.2 µg/m³2026-06-27: 13.1 µg/m³2026-06-28: 13.8 µg/m³2026-06-29: 19.2 µg/m³2026-06-30: 11.3 µg/m³2026-07-01: 12.4 µg/m³2026-07-02: 11.0 µg/m³2026-07-03: 9.3 µg/m³2026-07-04: 9.7 µg/m³2026-07-05: 9.0 µg/m³2026-07-06: 7.4 µg/m³2026-07-07: 10.3 µg/m³2026-07-08: 9.8 µg/m³2026-07-09: 8.4 µg/m³2026-07-10: 11.9 µg/m³2026-07-11: 12.1 µg/m³2026-07-12: 11.9 µg/m³2026-07-13: 12.9 µg/m³2026-07-14: 9.9 µg/m³2026-07-15: 15.7 µg/m³2026-07-16: 20.6 µg/m³2026-07-17: 14.5 µg/m³2026-07-18: 15.0 µg/m³2026-07-19: 18.2 µg/m³2026-07-20: 19.6 µg/m³2026-07-21: 17.4 µg/m³2026-07-22: 17.7 µg/m³2026-07-23: 11.5 µg/m³2026-07-24: 17.5 µg/m³2026-07-25: 16.7 µg/m³2026-07-26: 7.6 µg/m³2026-07-27: 8.7 µg/m³2026-07-28: 13.8 µg/m³2026-07-29: 12.2 µg/m³2026-07-30: 9.3 µg/m³2026-07-31: 10.6 µg/m³2026-08-01: 8.2 µg/m³2026-08-02: 8.4 µg/m³2026-08-03: 12.5 µg/m³2026-08-04: 19.4 µg/m³2026-08-05: 18.9 µg/m³2026-08-06: 10.7 µg/m³2026-08-07: 9.1 µg/m³2026-08-08: 9.4 µg/m³2026-08-09: 4.4 µg/m³2026-08-10: 6.1 µg/m³2026-08-11: 7.8 µg/m³2026-08-12: 7.9 µg/m³2026-08-13: 14.7 µg/m³2026-08-14: 18.3 µg/m³2026-08-15: 15.0 µg/m³2026-08-16: 9.6 µg/m³2026-08-17: 8.6 µg/m³2026-08-18: 9.7 µg/m³2026-08-19: 9.4 µg/m³2026-08-20: 13.4 µg/m³2026-08-21: 15.4 µg/m³2026-08-22: 14.5 µg/m³2026-08-23: 13.0 µg/m³2026-08-24: 12.8 µg/m³2026-08-25: 10.8 µg/m³2026-08-26: 9.3 µg/m³2026-08-27: 8.6 µg/m³2026-08-28: 8.8 µg/m³2026-08-29: 11.6 µg/m³2026-08-30: 6.8 µg/m³2026-08-31: 9.6 µg/m³2026-09-01: 8.6 µg/m³2026-09-02: 7.7 µg/m³2026-09-03: 7.6 µg/m³2026-09-04: 7.1 µg/m³2026-09-05: 7.0 µg/m³2026-09-06: 6.5 µg/m³2026-09-07: 5.8 µg/m³2026-09-08: 6.9 µg/m³2026-09-09: 7.6 µg/m³2026-09-10: 7.2 µg/m³2026-09-11: 7.5 µg/m³2026-09-12: 6.0 µg/m³2026-09-13: 4.7 µg/m³2026-09-14: 6.6 µg/m³2026-09-15: 11.1 µg/m³2026-09-16: 9.5 µg/m³2026-09-17: 9.1 µg/m³2026-09-18: 9.4 µg/m³2026-09-19: 8.0 µg/m³2026-09-20: 7.0 µg/m³2026-09-21: 7.2 µg/m³2026-09-22: 9.9 µg/m³2026-09-23: 13.3 µg/m³2026-09-24: 14.0 µg/m³2026-09-25: 11.6 µg/m³2026-09-26: 11.4 µg/m³2026-09-27: 8.4 µg/m³2026-09-28: 8.6 µg/m³2026-09-29: 5.7 µg/m³2026-09-30: 3.9 µg/m³
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data

54 of 358 measured days were over the WHO 24-hour guideline.

Daily world rank

#1#2181OctNovDecJanFebMarAprMayJunJulAugSep

Rank on each day's board (1 = most polluted city that day).

2026 against 2025, month by month

15Jan 2025: 11.1 µg/m³Jan 2026: 12.5 µg/m³JanFeb 2025: 11.0 µg/m³Feb 2026: 11.7 µg/m³FebMar 2025: 13.0 µg/m³Mar 2026: 8.1 µg/m³MarApr 2025: 12.3 µg/m³Apr 2026: 9.8 µg/m³AprMay 2025: 12.1 µg/m³May 2026: 9.5 µg/m³MayJun 2025: 12.6 µg/m³Jun 2026: 11.5 µg/m³JunJul 2025: 14.4 µg/m³Jul 2026: 12.7 µg/m³JulAug 2025: 11.9 µg/m³Aug 2026: 11.1 µg/m³AugSep 2025: 13.6 µg/m³Sep 2026: 8.2 µg/m³SepOct 2025: 11.8 µg/m³OctNov 2025: 9.4 µg/m³NovDec 2025: 12.2 µg/m³Dec

Faded bars: 2025. A month shows once it has 10 measured days.

This week against past years

This weekThis week: 9.1 µg/m³9.120252025: 13.3 µg/m³13.3

Mean PM2.5 for 24 Sept to 30 Sept in each year. Dashed line: WHO 24-hour guideline.

Monitors

StationOperatorType
Houston North Loop CUS Public DomainAirNowReference
Houston Park Place CUS Public DomainAirNowReference
Houston North WaysidUS Public DomainAirNowReference
Clinton C403US Public DomainAirNowReference
ACTS004.2CC0 1.0ClarityLow-cost
American Legion Park District CCC0 1.0ClarityLow-cost
ACTS007.2CC0 1.0ClarityLow-cost
Braeswood ParkCC0 1.0ClarityLow-cost
ACTS004.1CC0 1.0ClarityLow-cost
Wiley Park District CCC0 1.0ClarityLow-cost
Evan Chew Dog Park District CCC0 1.0ClarityLow-cost
Cottage Grove Park District CCC0 1.0ClarityLow-cost
COCO 4CC0 1.0ClarityLow-cost
COCO 1CC0 1.0ClarityLow-cost
West End ParkCC0 1.0ClarityLow-cost
COCO 5CC0 1.0ClarityLow-cost
BARCCC0 1.0ClarityLow-cost
Houston Health MuseumCC0 1.0ClarityLow-cost
COCO 2CC0 1.0ClarityLow-cost
Memorial Park Tennis CenterCC0 1.0ClarityLow-cost
ACTS001.2CC0 1.0ClarityLow-cost
ACTS006CC0 1.0ClarityLow-cost
SCRO 3CC0 1.0ClarityLow-cost
ACTS005.3CC0 1.0ClarityLow-cost
Heights 5 CornersCC BY 4.0BradLow-cost
ACTS003.4CC0 1.0ClarityLow-cost
ACTS002.5CC0 1.0ClarityLow-cost
Tuttle Neighborhood LibraryCC0 1.0ClarityLow-cost
5353 Fannin StCC BY 4.0AirGradientLow-cost
Moody Neighborhood LibraryCC0 1.0ClarityLow-cost
Avondale Promenade ParkCC0 1.0ClarityLow-cost
SCRO 1CC0 1.0ClarityLow-cost
Fire Station 31CC0 1.0ClarityLow-cost
Carnegie Neighborhood LibraryCC0 1.0ClarityLow-cost
Texas Southern UniversityCC0 1.0ClarityLow-cost
7411 Park Place Blvd.CC0 1.0ClarityLow-cost
Fire Station 24CC0 1.0ClarityLow-cost
Fire Station 45CC0 1.0ClarityLow-cost
Buffalo Bayou at ShepherdCC BY 4.0AirGradientLow-cost
SCRO 6CC0 1.0ClarityLow-cost
SCRO 2CC0 1.0ClarityLow-cost
Progressive New HopeCC BY 4.0Air Alliance HoustonLow-cost
100 Japhet StCC0 1.0ClarityLow-cost
COCO 3CC0 1.0ClarityLow-cost
AAH - Paige St (EaDo)CC BY 4.0Air Alliance HoustonLow-cost
AAH - Lamar StCC BY 4.0Air Alliance HoustonLow-cost
Houston PleasantvillUS Public DomainAirNowReference
Houston Finnigan ParUS Public DomainAirNowReference
Houston Finnigan ParUS Public DomainAirNowReference
AAH Third Ward Bike ShopCC BY 4.0Air Alliance HoustonLow-cost
AAH CarrolltonCC BY 4.0Air Alliance HoustonLow-cost
AAH - PalmerCC BY 4.0Air Alliance HoustonLow-cost
AAH - Rosalie StCC BY 4.0Air Alliance HoustonLow-cost
AAH - Grace LnCC BY 4.0Air Alliance HoustonLow-cost
AAH - Burkett StCC BY 4.0Air Alliance HoustonLow-cost
AAH Nassau RdCC BY 4.0Air Alliance HoustonLow-cost

The city's value is the median of its reference monitors each hour; low-cost sensors are listed but not counted when reference monitors exist. Data via OpenAQ; licences as listed. How we rank. Embed this on your site.

Other cities in United States

Calexico 22.9Jurupa Valley 12.9Riverside 12.4Little Rock 12.2Hanford 12.0Oceanside 11.9Laredo 11.4Clovis 11.2Fontana 11.2Corcoran 11.1Shreveport 11.0Wake Forest 11.0

30-day averages, µg/m³. All of United States →

Updated 2026-10-01 05:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.