SmogRank / United States / California

Air quality in Richmond

California, United States. PM2.5 from 1 reference monitor, updated hourly.

5.0 µg/m³
Good

Latest hour (03:00 UTC), 0.3× the WHO 24-hour guideline.

Rank

24 h
–
not enough data
7 days
#253
of 2,341 · 14.5 µg/m³
30 days
#427
of 2,337 · 9.6 µg/m³
Year
#1,098
of 2,166 · 8.7 µg/m³

Why it ranks here

Likely fire smoke. On Sep 29, when Richmond averaged 15.5 µg/m³ (its typical day: 8.3), NASA satellites detected 85 fires within 300 km (10 within 100 km). Smoke from those fires is a likely contributor; we don't check which way the wind blew, and mapped smoke can be high above the ground.

Based on Richmond's own measurements, with fire detections from NASA FIRMS and smoke maps from NOAA HMS; causes are the usual kinds for a pattern like this, not a confirmed source.

Last 4 days, hour by hour

15302026-09-30 23:00 UTC: 12.0 µg/m³2026-10-01 00:00 UTC: 10.0 µg/m³2026-10-01 01:00 UTC: 8.0 µg/m³2026-10-01 02:00 UTC: 7.0 µg/m³2026-10-01 03:00 UTC: 5.0 µg/m³Sep 28Sep 29Sep 30

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

Every day for a year

SepNovDecJanFebMarAprMayJunJulAugSepMonWedFri2025-09-29: 7.4 µg/m³2025-09-30: 3.4 µg/m³2025-10-01: 2.6 µg/m³2025-10-02: 5.0 µg/m³2025-10-03: 5.7 µg/m³2025-10-04: 14.3 µg/m³2025-10-05: 10.5 µg/m³2025-10-06: 6.5 µg/m³2025-10-07: 9.5 µg/m³2025-10-08: 6.9 µg/m³2025-10-09: 8.1 µg/m³2025-10-10: 5.2 µg/m³2025-10-11: 4.6 µg/m³2025-10-12: 4.7 µg/m³2025-10-13: 7.0 µg/m³2025-10-14: 3.3 µg/m³2025-10-15: 4.6 µg/m³2025-10-16: 5.8 µg/m³2025-10-17: 8.2 µg/m³2025-10-18: 10.0 µg/m³2025-10-19: 16.2 µg/m³2025-10-20: 6.6 µg/m³2025-10-21: 11.0 µg/m³2025-10-22: 8.2 µg/m³2025-10-23: 13.7 µg/m³2025-10-24: 9.4 µg/m³2025-10-25: 7.6 µg/m³2025-10-26: 8.7 µg/m³2025-10-27: 4.4 µg/m³2025-10-28: 5.3 µg/m³2025-10-29: 8.6 µg/m³2025-10-30: 15.5 µg/m³2025-10-31: 14.4 µg/m³2025-11-01: 15.3 µg/m³2025-11-02: 12.2 µg/m³2025-11-03: 10.8 µg/m³2025-11-04: 6.7 µg/m³2025-11-05: 4.3 µg/m³2025-11-06: 5.8 µg/m³2025-11-07: 7.6 µg/m³2025-11-08: 6.5 µg/m³2025-11-09: 10.2 µg/m³2025-11-10: 8.5 µg/m³2025-11-11: 13.3 µg/m³2025-11-12: 6.2 µg/m³2025-11-13: 9.9 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: no data2025-11-22: 12.2 µg/m³2025-11-23: 9.3 µg/m³2025-11-24: 10.6 µg/m³2025-11-25: 12.2 µg/m³2025-11-26: 10.6 µg/m³2025-11-27: 15.8 µg/m³2025-11-28: 13.4 µg/m³2025-11-29: 16.4 µg/m³2025-11-30: 15.4 µg/m³2025-12-01: 10.8 µg/m³2025-12-02: 12.7 µg/m³2025-12-03: 9.1 µg/m³2025-12-04: 13.6 µg/m³2025-12-05: 16.9 µg/m³2025-12-06: no data2025-12-07: no data2025-12-08: no data2025-12-09: 16.7 µg/m³2025-12-10: 14.2 µg/m³2025-12-11: 10.7 µg/m³2025-12-12: 8.4 µg/m³2025-12-13: 9.0 µg/m³2025-12-14: 12.2 µg/m³2025-12-15: 13.6 µg/m³2025-12-16: 10.4 µg/m³2025-12-17: 5.8 µg/m³2025-12-18: 8.7 µg/m³2025-12-19: 14.3 µg/m³2025-12-20: 7.3 µg/m³2025-12-21: 11.0 µg/m³2025-12-22: 6.0 µg/m³2025-12-23: 10.0 µg/m³2025-12-24: 5.5 µg/m³2025-12-25: 3.1 µg/m³2025-12-26: 8.0 µg/m³2025-12-27: 3.9 µg/m³2025-12-28: 4.1 µg/m³2025-12-29: 4.1 µg/m³2025-12-30: 10.4 µg/m³2025-12-31: 7.8 µg/m³2026-01-01: 2.9 µg/m³2026-01-02: 4.3 µg/m³2026-01-03: 7.1 µg/m³2026-01-04: 11.2 µg/m³2026-01-05: 4.7 µg/m³2026-01-06: 4.3 µg/m³2026-01-07: 5.5 µg/m³2026-01-08: 3.8 µg/m³2026-01-09: 4.9 µg/m³2026-01-10: 9.3 µg/m³2026-01-11: 9.7 µg/m³2026-01-12: 11.9 µg/m³2026-01-13: 11.8 µg/m³2026-01-14: 15.5 µg/m³2026-01-15: 16.0 µg/m³2026-01-16: 11.7 µg/m³2026-01-17: 16.5 µg/m³2026-01-18: 16.4 µg/m³2026-01-19: 9.7 µg/m³2026-01-20: 9.7 µg/m³2026-01-21: 13.6 µg/m³2026-01-22: 14.8 µg/m³2026-01-23: 14.9 µg/m³2026-01-24: 10.8 µg/m³2026-01-25: 13.5 µg/m³2026-01-26: 14.0 µg/m³2026-01-27: 14.0 µg/m³2026-01-28: 6.5 µg/m³2026-01-29: 6.3 µg/m³2026-01-30: 11.9 µg/m³2026-01-31: 12.6 µg/m³2026-02-01: 11.4 µg/m³2026-02-02: 6.6 µg/m³2026-02-03: 12.4 µg/m³2026-02-04: 17.3 µg/m³2026-02-05: 17.6 µg/m³2026-02-06: 16.1 µg/m³2026-02-07: 11.0 µg/m³2026-02-08: 11.9 µg/m³2026-02-09: 5.7 µg/m³2026-02-10: 8.0 µg/m³2026-02-11: 3.1 µg/m³2026-02-12: 4.8 µg/m³2026-02-13: 10.4 µg/m³2026-02-14: 6.8 µg/m³2026-02-15: 12.5 µg/m³2026-02-16: 6.5 µg/m³2026-02-17: 3.3 µg/m³2026-02-18: 3.4 µg/m³2026-02-19: 3.0 µg/m³2026-02-20: 3.8 µg/m³2026-02-21: 8.5 µg/m³2026-02-22: 4.7 µg/m³2026-02-23: 5.9 µg/m³2026-02-24: 3.2 µg/m³2026-02-25: 1.8 µg/m³2026-02-26: 2.6 µg/m³2026-02-27: 4.2 µg/m³2026-02-28: 7.7 µg/m³2026-03-01: 5.6 µg/m³2026-03-02: 3.9 µg/m³2026-03-03: 5.7 µg/m³2026-03-04: 3.4 µg/m³2026-03-05: 10.0 µg/m³2026-03-06: 2.4 µg/m³2026-03-07: 3.1 µg/m³2026-03-08: 8.1 µg/m³2026-03-09: 9.1 µg/m³2026-03-10: 11.4 µg/m³2026-03-11: 4.8 µg/m³2026-03-12: 7.6 µg/m³2026-03-13: 7.2 µg/m³2026-03-14: 10.8 µg/m³2026-03-15: 6.8 µg/m³2026-03-16: 6.0 µg/m³2026-03-17: 8.9 µg/m³2026-03-18: 7.1 µg/m³2026-03-19: 7.3 µg/m³2026-03-20: 8.0 µg/m³2026-03-21: 14.4 µg/m³2026-03-22: 19.3 µg/m³2026-03-23: 14.0 µg/m³2026-03-24: 9.4 µg/m³2026-03-25: 4.7 µg/m³2026-03-26: 5.5 µg/m³2026-03-27: 6.8 µg/m³2026-03-28: 17.1 µg/m³2026-03-29: 9.1 µg/m³2026-03-30: 10.4 µg/m³2026-03-31: 8.2 µg/m³2026-04-01: 3.8 µg/m³2026-04-02: 4.2 µg/m³2026-04-03: 4.1 µg/m³2026-04-04: 4.1 µg/m³2026-04-05: 5.4 µg/m³2026-04-06: 8.3 µg/m³2026-04-07: no data2026-04-08: no data2026-04-09: no data2026-04-10: no data2026-04-11: no data2026-04-12: no data2026-04-13: no data2026-04-14: no data2026-04-15: no data2026-04-16: no data2026-04-17: no data2026-04-18: no data2026-04-19: no data2026-04-20: no data2026-04-21: no data2026-04-22: no data2026-04-23: no data2026-04-24: no data2026-04-25: no data2026-04-26: no data2026-04-27: no data2026-04-28: no data2026-04-29: no data2026-04-30: no data2026-05-01: no data2026-05-02: no data2026-05-03: no data2026-05-04: no data2026-05-05: no data2026-05-06: no data2026-05-07: no data2026-05-08: no data2026-05-09: no data2026-05-10: no data2026-05-11: no data2026-05-12: no data2026-05-13: no data2026-05-14: no data2026-05-15: no data2026-05-16: no data2026-05-17: no data2026-05-18: no data2026-05-19: no data2026-05-20: no data2026-05-21: no data2026-05-22: no data2026-05-23: no data2026-05-24: no data2026-05-25: no data2026-05-26: no data2026-05-27: no data2026-05-28: no data2026-05-29: no data2026-05-30: no data2026-05-31: no data2026-06-01: no data2026-06-02: no data2026-06-03: no data2026-06-04: no data2026-06-05: no data2026-06-06: no data2026-06-07: no data2026-06-08: no data2026-06-09: 6.2 µg/m³2026-06-10: 11.8 µg/m³2026-06-11: 16.9 µg/m³2026-06-12: 8.0 µg/m³2026-06-13: 9.0 µg/m³2026-06-14: 5.8 µg/m³2026-06-15: 6.1 µg/m³2026-06-16: 4.2 µg/m³2026-06-17: 3.2 µg/m³2026-06-18: 0.8 µg/m³2026-06-19: 1.7 µg/m³2026-06-20: 2.5 µg/m³2026-06-21: 7.8 µg/m³2026-06-22: 8.3 µg/m³2026-06-23: 7.0 µg/m³2026-06-24: 2.2 µg/m³2026-06-25: 3.9 µg/m³2026-06-26: 4.7 µg/m³2026-06-27: 2.8 µg/m³2026-06-28: 9.5 µg/m³2026-06-29: 13.2 µg/m³2026-06-30: 12.7 µg/m³2026-07-01: 10.8 µg/m³2026-07-02: 9.3 µg/m³2026-07-03: 6.5 µg/m³2026-07-04: 9.4 µg/m³2026-07-05: 3.5 µg/m³2026-07-06: 3.1 µg/m³2026-07-07: 7.7 µg/m³2026-07-08: 4.3 µg/m³2026-07-09: no data2026-07-10: no data2026-07-11: no data2026-07-12: no data2026-07-13: no data2026-07-14: 15.3 µg/m³2026-07-15: 11.7 µg/m³2026-07-16: 16.1 µg/m³2026-07-17: 12.1 µg/m³2026-07-18: 8.7 µg/m³2026-07-19: 8.4 µg/m³2026-07-20: 5.0 µg/m³2026-07-21: 4.5 µg/m³2026-07-22: 0.7 µg/m³2026-07-23: 7.3 µg/m³2026-07-24: 7.0 µg/m³2026-07-25: 10.3 µg/m³2026-07-26: 7.4 µg/m³2026-07-27: 6.8 µg/m³2026-07-28: 9.0 µg/m³2026-07-29: 6.9 µg/m³2026-07-30: 13.6 µg/m³2026-07-31: 16.4 µg/m³2026-08-01: 15.8 µg/m³2026-08-02: 19.3 µg/m³2026-08-03: 19.2 µg/m³2026-08-04: 9.9 µg/m³2026-08-05: 6.8 µg/m³2026-08-06: 9.3 µg/m³2026-08-07: 9.2 µg/m³2026-08-08: 14.9 µg/m³2026-08-09: 14.5 µg/m³2026-08-10: 13.1 µg/m³2026-08-11: 8.1 µg/m³2026-08-12: 3.7 µg/m³2026-08-13: 2.1 µg/m³2026-08-14: 3.2 µg/m³2026-08-15: 10.8 µg/m³2026-08-16: 9.9 µg/m³2026-08-17: 9.4 µg/m³2026-08-18: 8.0 µg/m³2026-08-19: 4.8 µg/m³2026-08-20: 5.8 µg/m³2026-08-21: 6.8 µg/m³2026-08-22: 11.9 µg/m³2026-08-23: 11.6 µg/m³2026-08-24: 7.5 µg/m³2026-08-25: 7.4 µg/m³2026-08-26: 2.6 µg/m³2026-08-27: 8.9 µg/m³2026-08-28: 11.2 µg/m³2026-08-29: 13.1 µg/m³2026-08-30: 15.3 µg/m³2026-08-31: no data2026-09-01: 4.8 µg/m³2026-09-02: 3.1 µg/m³2026-09-03: 4.4 µg/m³2026-09-04: 5.9 µg/m³2026-09-05: 10.0 µg/m³2026-09-06: 10.9 µg/m³2026-09-07: 4.9 µg/m³2026-09-08: 15.0 µg/m³2026-09-09: 5.3 µg/m³2026-09-10: 13.4 µg/m³2026-09-11: 11.9 µg/m³2026-09-12: 13.2 µg/m³2026-09-13: 3.0 µg/m³2026-09-14: no data2026-09-15: 12.6 µg/m³2026-09-16: 6.6 µg/m³2026-09-17: 6.6 µg/m³2026-09-18: 10.0 µg/m³2026-09-19: 13.6 µg/m³2026-09-20: 11.0 µg/m³2026-09-21: 3.0 µg/m³2026-09-22: 9.0 µg/m³2026-09-23: 15.2 µg/m³2026-09-24: no data2026-09-25: no data2026-09-26: 14.7 µg/m³2026-09-27: 13.5 µg/m³2026-09-28: 13.5 µg/m³2026-09-29: 15.5 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

27 of 282 measured days were over the WHO 24-hour guideline.

Daily world rank

#1#2284OctNovDecJanFebMarAprMayJunJulAugSep

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

2026 against 2025, month by month

15Jan 2025: 7.2 µg/m³Jan 2026: 10.3 µg/m³JanFeb 2026: 7.7 µg/m³FebMar 2025: 7.1 µg/m³Mar 2026: 8.3 µg/m³MarApr 2025: 9.9 µg/m³AprMay 2025: 11.0 µg/m³MayJun 2025: 9.5 µg/m³Jun 2026: 6.7 µg/m³JunJul 2025: 5.5 µg/m³Jul 2026: 8.5 µg/m³JulAug 2025: 8.7 µg/m³Aug 2026: 9.8 µg/m³AugSep 2025: 8.1 µg/m³Sep 2026: 9.6 µg/m³SepOct 2025: 8.1 µg/m³OctNov 2025: 10.6 µg/m³NovDec 2025: 9.6 µg/m³Dec

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

This week against past years

This weekThis week: 14.5 µg/m³14.520252025: 12.4 µg/m³12.4

Mean PM2.5 for 23 Sept to 29 Sept in each year. Dashed line: WHO 24-hour guideline.

Monitors

StationOperatorType
San Pablo - RumrillUS Public DomainAirNowReference
AF8S4S0WCC0 1.0ClarityLow-cost
A0W43KMCCC0 1.0ClarityLow-cost
A25JBW3HCC0 1.0ClarityLow-cost
AMKY1B59CC0 1.0ClarityLow-cost
AMKRF32SCC0 1.0ClarityLow-cost
A8BXKNP2CC0 1.0ClarityLow-cost
ATTHY5CQCC0 1.0ClarityLow-cost
A0FFXKYHCC0 1.0ClarityLow-cost
A86PBJJFCC0 1.0ClarityLow-cost
AZ30S6W3CC0 1.0ClarityLow-cost
AWCCW9MMCC0 1.0ClarityLow-cost
A311XXZCCC0 1.0ClarityLow-cost
A3V0NM6ZCC0 1.0ClarityLow-cost
A8TPTJNJCC0 1.0ClarityLow-cost
AW1VP29ZCC0 1.0ClarityLow-cost
AC4KZBMMCC0 1.0ClarityLow-cost
A9S4GHH5CC0 1.0ClarityLow-cost
A380DN6YCC0 1.0ClarityLow-cost
Marina Way S. @ Cutting BlvdCC BY 4.0AirGradientLow-cost
Lyford Dr, Tiburon, CaliforniaCC BY 4.0AirGradientLow-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 12.0Hanford 12.0Oceanside 11.9Laredo 11.8Clovis 11.2Fontana 11.2Corcoran 11.1Shreveport 11.0Wake Forest 11.0

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

Updated 2026-10-01 04:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.