SmogRank / United States / Arizona

Air quality in Phoenix

Arizona, United States. PM2.5 from 6 reference monitors, updated hourly.

6.8µg/m³
Good

Latest hour (17:00 UTC), 0.5× the WHO 24-hour guideline. 24-hour average 4.7 µg/m³.

Rank among 666 cities

24 hours#524of 666, at 4.7 µg/m³
7 days#1,963of 2,330, at 4.5 µg/m³
30 days#1,856of 2,324, at 4.8 µg/m³
This year#1,385of 2,173, at 8.1 µg/m³

Why it ranks here

Seasonal. Over the past year its worst months were January, November, December, averaging up to 15.4 µg/m³ against 4.8 in its cleanest month. Seasonal peaks usually come from heating, crop burning, fire or dust seasons.

Based on Phoenix's own measurements; causes are the usual kinds for a pattern like this, not a confirmed source.

The last 12 months, day by day

1102031Oct 2025NovDecJan 2026FebMarAprMayJunJulAugSep2025-10-01: 6.3 µg/m³2025-10-02: 6.2 µg/m³2025-10-03: 5.4 µg/m³2025-10-04: 8.2 µg/m³2025-10-05: 8.2 µg/m³2025-10-06: 8.0 µg/m³2025-10-07: 8.7 µg/m³2025-10-08: 7.7 µg/m³2025-10-09: 8.9 µg/m³2025-10-10: 7.6 µg/m³2025-10-11: 4.4 µg/m³2025-10-12: 4.2 µg/m³2025-10-13: 5.3 µg/m³2025-10-14: 6.4 µg/m³2025-10-15: 6.8 µg/m³2025-10-16: 5.0 µg/m³2025-10-17: 7.2 µg/m³2025-10-18: 9.3 µg/m³2025-10-19: 11.4 µg/m³2025-10-20: 9.8 µg/m³2025-10-21: 9.3 µg/m³2025-10-22: 10.7 µg/m³2025-10-23: 11.3 µg/m³2025-10-24: 10.4 µg/m³2025-10-25: 10.1 µg/m³2025-10-26: 10.1 µg/m³2025-10-27: 7.5 µg/m³2025-10-28: 6.3 µg/m³2025-10-29: 7.6 µg/m³2025-10-30: 9.9 µg/m³2025-10-31: 13.7 µg/m³2025-11-01: 14.5 µg/m³2025-11-02: 12.8 µg/m³2025-11-03: 11.6 µg/m³2025-11-04: 9.4 µg/m³2025-11-05: 8.8 µg/m³2025-11-06: 9.0 µg/m³2025-11-07: 10.8 µg/m³2025-11-08: 13.4 µg/m³2025-11-09: 11.6 µg/m³2025-11-10: 9.1 µg/m³2025-11-11: 16.6 µg/m³2025-11-12: 16.2 µg/m³2025-11-13: 18.8 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: 5.6 µg/m³2025-11-21: 5.9 µg/m³2025-11-22: 7.9 µg/m³2025-11-23: 4.6 µg/m³2025-11-24: 13.0 µg/m³2025-11-25: 16.3 µg/m³2025-11-26: 17.3 µg/m³2025-11-27: 20.2 µg/m³2025-11-28: 23.2 µg/m³2025-11-29: 21.0 µg/m³2025-11-30: 15.7 µg/m³2025-12-01: 17.2 µg/m³2025-12-02: 11.5 µg/m³2025-12-03: 14.1 µg/m³2025-12-04: 10.9 µg/m³2025-12-05: 14.7 µg/m³2025-12-06: 17.5 µg/m³2025-12-07: 22.5 µg/m³2025-12-08: 15.1 µg/m³2025-12-09: 15.9 µg/m³2025-12-10: 16.7 µg/m³2025-12-11: 20.2 µg/m³2025-12-12: 19.2 µg/m³2025-12-13: 18.7 µg/m³2025-12-14: 17.8 µg/m³2025-12-15: 18.1 µg/m³2025-12-16: 17.3 µg/m³2025-12-17: 20.8 µg/m³2025-12-18: 16.5 µg/m³2025-12-19: 15.0 µg/m³2025-12-20: 18.0 µg/m³2025-12-21: 18.9 µg/m³2025-12-22: 13.9 µg/m³2025-12-23: 10.3 µg/m³2025-12-24: 9.3 µg/m³2025-12-25: 17.1 µg/m³2025-12-26: 14.5 µg/m³2025-12-27: 12.2 µg/m³2025-12-28: 9.2 µg/m³2025-12-29: 5.8 µg/m³2025-12-30: 6.7 µg/m³2025-12-31: 22.1 µg/m³2026-01-01: 22.0 µg/m³2026-01-02: 16.3 µg/m³2026-01-03: 16.3 µg/m³2026-01-04: 20.1 µg/m³2026-01-05: 12.1 µg/m³2026-01-06: 10.9 µg/m³2026-01-07: 7.1 µg/m³2026-01-08: 4.8 µg/m³2026-01-09: 4.2 µg/m³2026-01-10: 9.1 µg/m³2026-01-11: 4.6 µg/m³2026-01-12: 7.0 µg/m³2026-01-13: 13.9 µg/m³2026-01-14: 12.5 µg/m³2026-01-15: 11.4 µg/m³2026-01-16: 16.6 µg/m³2026-01-17: 18.0 µg/m³2026-01-18: 25.1 µg/m³2026-01-19: 14.8 µg/m³2026-01-20: 14.6 µg/m³2026-01-21: 11.8 µg/m³2026-01-22: 11.4 µg/m³2026-01-23: 9.1 µg/m³2026-01-24: 13.4 µg/m³2026-01-25: 8.4 µg/m³2026-01-26: 9.7 µg/m³2026-01-27: 8.7 µg/m³2026-01-28: 13.8 µg/m³2026-01-29: 18.1 µg/m³2026-01-30: 20.1 µg/m³2026-01-31: 15.3 µg/m³2026-02-01: 13.2 µg/m³2026-02-02: 12.1 µg/m³2026-02-03: 14.0 µg/m³2026-02-04: 8.7 µg/m³2026-02-05: 6.0 µg/m³2026-02-06: 7.9 µg/m³2026-02-07: 12.3 µg/m³2026-02-08: 12.0 µg/m³2026-02-09: 10.5 µg/m³2026-02-10: 9.0 µg/m³2026-02-11: 10.1 µg/m³2026-02-12: 10.9 µg/m³2026-02-13: 7.3 µg/m³2026-02-14: 8.0 µg/m³2026-02-15: 9.3 µg/m³2026-02-16: 6.3 µg/m³2026-02-17: 3.9 µg/m³2026-02-18: 4.9 µg/m³2026-02-19: 6.1 µg/m³2026-02-20: 4.6 µg/m³2026-02-21: 10.7 µg/m³2026-02-22: 11.0 µg/m³2026-02-23: 11.5 µg/m³2026-02-24: 10.7 µg/m³2026-02-25: 9.7 µg/m³2026-02-26: 9.9 µg/m³2026-02-27: 10.9 µg/m³2026-02-28: 9.7 µg/m³2026-03-01: 10.9 µg/m³2026-03-02: 9.1 µg/m³2026-03-03: 8.5 µg/m³2026-03-04: 7.2 µg/m³2026-03-05: 6.8 µg/m³2026-03-06: 3.9 µg/m³2026-03-07: 6.2 µg/m³2026-03-08: 8.9 µg/m³2026-03-09: 7.8 µg/m³2026-03-10: 5.7 µg/m³2026-03-11: 7.5 µg/m³2026-03-12: 8.4 µg/m³2026-03-13: 8.5 µg/m³2026-03-14: 7.4 µg/m³2026-03-15: 5.3 µg/m³2026-03-16: 6.7 µg/m³2026-03-17: 7.0 µg/m³2026-03-18: 8.1 µg/m³2026-03-19: 9.7 µg/m³2026-03-20: 8.8 µg/m³2026-03-21: 8.7 µg/m³2026-03-22: 7.9 µg/m³2026-03-23: 7.4 µg/m³2026-03-24: 6.8 µg/m³2026-03-25: 8.3 µg/m³2026-03-26: 8.4 µg/m³2026-03-27: 8.0 µg/m³2026-03-28: 18.9 µg/m³2026-03-29: 12.2 µg/m³2026-03-30: 9.6 µg/m³2026-03-31: 8.8 µg/m³2026-04-01: 4.5 µg/m³2026-04-02: 4.8 µg/m³2026-04-03: 5.1 µg/m³2026-04-04: 4.2 µg/m³2026-04-05: 7.4 µg/m³2026-04-06: 8.3 µg/m³2026-04-07: 6.8 µg/m³2026-04-08: 6.8 µg/m³2026-04-09: 6.4 µg/m³2026-04-10: 7.5 µg/m³2026-04-11: 3.7 µg/m³2026-04-12: 3.2 µg/m³2026-04-13: 5.6 µg/m³2026-04-14: 5.3 µg/m³2026-04-15: 7.4 µg/m³2026-04-16: 6.6 µg/m³2026-04-17: 6.5 µg/m³2026-04-18: 8.9 µg/m³2026-04-19: 12.5 µg/m³2026-04-20: 8.4 µg/m³2026-04-21: 9.4 µg/m³2026-04-22: 8.8 µg/m³2026-04-23: 5.1 µg/m³2026-04-24: 6.9 µg/m³2026-04-25: 4.8 µg/m³2026-04-26: 6.7 µg/m³2026-04-27: 8.2 µg/m³2026-04-28: 9.3 µg/m³2026-04-29: 9.7 µg/m³2026-04-30: 9.5 µg/m³2026-05-01: 6.7 µg/m³2026-05-02: 6.7 µg/m³2026-05-03: 5.4 µg/m³2026-05-04: 8.9 µg/m³2026-05-05: 4.9 µg/m³2026-05-06: 8.5 µg/m³2026-05-07: 7.7 µg/m³2026-05-08: 7.3 µg/m³2026-05-09: 6.4 µg/m³2026-05-10: 8.5 µg/m³2026-05-11: 10.3 µg/m³2026-05-12: 10.0 µg/m³2026-05-13: 5.7 µg/m³2026-05-14: 5.7 µg/m³2026-05-15: 6.4 µg/m³2026-05-16: 6.1 µg/m³2026-05-17: 6.1 µg/m³2026-05-18: 12.9 µg/m³2026-05-19: 6.1 µg/m³2026-05-20: 5.9 µg/m³2026-05-21: 6.8 µg/m³2026-05-22: 6.8 µg/m³2026-05-23: 6.0 µg/m³2026-05-24: 7.3 µg/m³2026-05-25: 6.2 µg/m³2026-05-26: 6.3 µg/m³2026-05-27: 5.9 µg/m³2026-05-28: 5.4 µg/m³2026-05-29: 4.7 µg/m³2026-05-30: 4.8 µg/m³2026-05-31: 6.4 µg/m³2026-06-01: 7.8 µg/m³2026-06-02: 5.4 µg/m³2026-06-03: 5.8 µg/m³2026-06-04: 7.4 µg/m³2026-06-05: 6.6 µg/m³2026-06-06: 5.5 µg/m³2026-06-07: 5.8 µg/m³2026-06-08: 6.7 µg/m³2026-06-09: 6.6 µg/m³2026-06-10: 7.1 µg/m³2026-06-11: 7.2 µg/m³2026-06-12: 6.5 µg/m³2026-06-13: 6.3 µg/m³2026-06-14: 5.9 µg/m³2026-06-15: 6.4 µg/m³2026-06-16: 6.9 µg/m³2026-06-17: 7.7 µg/m³2026-06-18: 6.3 µg/m³2026-06-19: 5.4 µg/m³2026-06-20: 5.8 µg/m³2026-06-21: 5.5 µg/m³2026-06-22: 5.2 µg/m³2026-06-23: 6.1 µg/m³2026-06-24: 6.4 µg/m³2026-06-25: 5.9 µg/m³2026-06-26: 4.8 µg/m³2026-06-27: 3.9 µg/m³2026-06-28: 4.1 µg/m³2026-06-29: 4.6 µg/m³2026-06-30: 4.8 µg/m³2026-07-01: 3.6 µg/m³2026-07-02: 5.5 µg/m³2026-07-03: 6.5 µg/m³2026-07-04: 18.6 µg/m³2026-07-05: 40.4 µg/m³2026-07-06: 7.3 µg/m³2026-07-07: 7.2 µg/m³2026-07-08: 5.6 µg/m³2026-07-09: 8.0 µg/m³2026-07-10: 11.2 µg/m³2026-07-11: 12.4 µg/m³2026-07-12: 28.6 µg/m³2026-07-13: 8.9 µg/m³2026-07-14: 8.0 µg/m³2026-07-15: 7.1 µg/m³2026-07-16: 6.2 µg/m³2026-07-17: 5.0 µg/m³2026-07-18: 5.7 µg/m³2026-07-19: 5.0 µg/m³2026-07-20: 5.2 µg/m³2026-07-21: 4.9 µg/m³2026-07-22: 4.5 µg/m³2026-07-23: 4.9 µg/m³2026-07-24: 5.8 µg/m³2026-07-25: 5.9 µg/m³2026-07-26: 6.1 µg/m³2026-07-27: 5.6 µg/m³2026-07-28: 7.1 µg/m³2026-07-29: 5.3 µg/m³2026-07-30: 5.7 µg/m³2026-07-31: 5.6 µg/m³2026-08-01: 4.3 µg/m³2026-08-02: 5.1 µg/m³2026-08-03: 27.4 µg/m³2026-08-04: 23.6 µg/m³2026-08-05: 6.5 µg/m³2026-08-06: 25.3 µg/m³2026-08-07: 6.6 µg/m³2026-08-08: 8.3 µg/m³2026-08-09: 10.2 µg/m³2026-08-10: 10.2 µg/m³2026-08-11: 7.0 µg/m³2026-08-12: 7.0 µg/m³2026-08-13: 5.3 µg/m³2026-08-14: 5.8 µg/m³2026-08-15: 6.1 µg/m³2026-08-16: 6.2 µg/m³2026-08-17: 6.3 µg/m³2026-08-18: 6.4 µg/m³2026-08-19: 7.2 µg/m³2026-08-20: 4.0 µg/m³2026-08-21: 7.4 µg/m³2026-08-22: 6.4 µg/m³2026-08-23: 19.7 µg/m³2026-08-24: 7.1 µg/m³2026-08-25: 7.6 µg/m³2026-08-26: 7.8 µg/m³2026-08-27: 9.1 µg/m³2026-08-28: 12.3 µg/m³2026-08-29: 11.9 µg/m³2026-08-30: 6.1 µg/m³2026-08-31: 4.6 µg/m³2026-09-01: 4.3 µg/m³2026-09-02: 6.2 µg/m³2026-09-03: 5.5 µg/m³2026-09-04: 5.2 µg/m³2026-09-05: 5.1 µg/m³2026-09-06: 3.9 µg/m³2026-09-07: 1.3 µg/m³2026-09-08: 3.6 µg/m³2026-09-09: 5.0 µg/m³2026-09-10: 5.7 µg/m³2026-09-11: 4.5 µg/m³2026-09-12: 3.9 µg/m³2026-09-13: 4.4 µg/m³2026-09-14: 8.4 µg/m³2026-09-15: 5.8 µg/m³2026-09-16: 5.5 µg/m³2026-09-17: 4.2 µg/m³2026-09-18: 4.7 µg/m³2026-09-19: 5.4 µg/m³2026-09-20: 4.2 µg/m³2026-09-21: 5.2 µg/m³2026-09-22: 5.0 µg/m³2026-09-23: 4.1 µg/m³2026-09-24: 4.2 µg/m³2026-09-25: 5.1 µg/m³2026-09-26: 6.0 µg/m³2026-09-27: 4.1 µg/m³2026-09-28: 3.7 µg/m³2026-09-29: 4.1 µg/m³2026-09-30: no data
45 of 358 measured days were over the WHO 24-hour guideline (15 µg/m³). One row per month, one square per local day.
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

Last 4 days, hour by hour

15302026-10-01 00:00 UTC: 4.5 µg/m³2026-10-01 01:00 UTC: 4.7 µg/m³2026-10-01 02:00 UTC: 3.5 µg/m³2026-10-01 03:00 UTC: 4.3 µg/m³2026-10-01 04:00 UTC: 3.7 µg/m³2026-10-01 05:00 UTC: 3.4 µg/m³2026-10-01 06:00 UTC: 2.1 µg/m³2026-10-01 07:00 UTC: 4.8 µg/m³2026-10-01 08:00 UTC: 4.8 µg/m³2026-10-01 09:00 UTC: 3.1 µg/m³2026-10-01 10:00 UTC: 5.5 µg/m³2026-10-01 11:00 UTC: 4.7 µg/m³2026-10-01 12:00 UTC: 5.4 µg/m³2026-10-01 13:00 UTC: 5.4 µg/m³2026-10-01 14:00 UTC: 4.3 µg/m³2026-10-01 15:00 UTC: 7.3 µg/m³2026-10-01 16:00 UTC: 5.9 µg/m³2026-10-01 17:00 UTC: 6.8 µg/m³Sep 28Sep 29Sep 30Oct 1
Times in UTC. Dashed line: WHO 24-hour guideline (15 µg/m³).

Its world rank, day by day

#1#2305OctNovDecJanFebMarAprMayJunJulAugSep
Rank on each day's board (1 = most polluted city that day).

2026 against 2025, month by month

15Jan 2025: 20.5 µg/m³Jan 2026: 12.9 µg/m³JanFeb 2025: 11.9 µg/m³Feb 2026: 9.3 µg/m³FebMar 2025: 7.6 µg/m³Mar 2026: 8.3 µg/m³MarApr 2025: 6.4 µg/m³Apr 2026: 6.9 µg/m³AprMay 2025: 6.3 µg/m³May 2026: 6.9 µg/m³MayJun 2025: 6.2 µg/m³Jun 2026: 6.0 µg/m³JunJul 2025: 6.8 µg/m³Jul 2026: 8.6 µg/m³JulAug 2025: 7.9 µg/m³Aug 2026: 9.3 µg/m³AugSep 2025: 6.3 µg/m³Sep 2026: 4.8 µg/m³SepOct 2025: 8.1 µg/m³OctNov 2025: 13.1 µg/m³NovDec 2025: 15.4 µg/m³Dec
Faded bars: 2025. A month shows once it has 10 measured days.

This week against past years

This weekThis week: 4.5 µg/m³4.520252025: 6.3 µg/m³6.320242024: 8.4 µg/m³8.420232023: 7.0 µg/m³7.0
Mean PM2.5 for 24 Sept to 30 Sept in each year. Dashed line: WHO 24-hour guideline.

Monitors

16 monitors: 6 reference, 10 low-cost
StationOperatorType
Thirty ThirdUS Public DomainAirNowReference
West PhoenixUS Public DomainAirNowReference
South PhoenixUS Public DomainAirNowReference
Durango ComplexUS Public DomainAirNowReference
Phoenix JLG SupersitUS Public DomainAirNowReference
EastwoodUS Public DomainAirNowReference
Paideia Learning Academy Parking LotCC0 1.0ClarityLow-cost
Paideia Parking Lot 2CC0 1.0ClarityLow-cost
SagradoCC0 1.0ClarityLow-cost
Paideia Elementary Playspace (2B)CC0 1.0ClarityLow-cost
Central & W Saint AnneCC0 1.0ClarityLow-cost
Southwest ElementaryCC0 1.0ClarityLow-cost
Saint MatthewsCC0 1.0ClarityLow-cost
Sun ValleyCC0 1.0ClarityLow-cost
Cesar ChavezCC0 1.0ClarityLow-cost
Irene LopezCC0 1.0ClarityLow-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

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

Updated 2026-10-01 18:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.