SmogRank / United States / California

Air quality in Delano

California, United States. PM2.5 from 12 low-cost sensors, updated hourly.

8.8µg/m³
Good

Latest hour (17:00 UTC), 0.6× the WHO 24-hour guideline.

Rank, worst first

24 hours–not enough data
7 days#1,570of 2,330, at 5.8 µg/m³
30 days#955of 2,324, at 6.7 µg/m³
This year#419of 2,173, at 12.2 µg/m³

Why it ranks here

Seasonal. Over the past year its worst months were January, averaging up to 32.6 µg/m³ against 4.0 in its cleanest month. Seasonal peaks usually come from heating, crop burning, fire or dust seasons.

Based on Delano'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: no data2025-10-02: no data2025-10-03: no data2025-10-04: no data2025-10-05: no data2025-10-06: no data2025-10-07: no data2025-10-08: no data2025-10-09: no data2025-10-10: no data2025-10-11: no data2025-10-12: no data2025-10-13: no data2025-10-14: no data2025-10-15: no data2025-10-16: no data2025-10-17: no data2025-10-18: no data2025-10-19: no data2025-10-20: no data2025-10-21: no data2025-10-22: no data2025-10-23: no data2025-10-24: no data2025-10-25: no data2025-10-26: no data2025-10-27: no data2025-10-28: 32.2 µg/m³2025-10-29: 34.0 µg/m³2025-10-30: 36.3 µg/m³2025-10-31: 36.9 µg/m³2025-11-01: 45.8 µg/m³2025-11-02: 42.9 µg/m³2025-11-03: 34.7 µg/m³2025-11-04: 22.9 µg/m³2025-11-05: 11.9 µg/m³2025-11-06: 9.3 µg/m³2025-11-07: 7.4 µg/m³2025-11-08: 16.7 µg/m³2025-11-09: 24.5 µg/m³2025-11-10: 27.2 µg/m³2025-11-11: 28.0 µg/m³2025-11-12: 12.6 µg/m³2025-11-13: 10.2 µg/m³2025-11-14: 3.4 µg/m³2025-11-15: 17.5 µg/m³2025-11-16: 1.5 µg/m³2025-11-17: 2.1 µg/m³2025-11-18: 11.4 µg/m³2025-11-19: 21.5 µg/m³2025-11-20: 14.4 µg/m³2025-11-21: 30.4 µg/m³2025-11-22: 33.6 µg/m³2025-11-23: 33.8 µg/m³2025-11-24: 34.0 µg/m³2025-11-25: 33.6 µg/m³2025-11-26: 38.9 µg/m³2025-11-27: 40.8 µg/m³2025-11-28: 37.6 µg/m³2025-11-29: 35.5 µg/m³2025-11-30: 33.8 µg/m³2025-12-01: 32.5 µg/m³2025-12-02: 38.4 µg/m³2025-12-03: 25.3 µg/m³2025-12-04: 36.6 µg/m³2025-12-05: 39.2 µg/m³2025-12-06: 38.8 µg/m³2025-12-07: 39.0 µg/m³2025-12-08: 35.4 µg/m³2025-12-09: 35.0 µg/m³2025-12-10: 31.2 µg/m³2025-12-11: 24.8 µg/m³2025-12-12: 27.8 µg/m³2025-12-13: 24.7 µg/m³2025-12-14: 21.8 µg/m³2025-12-15: 24.4 µg/m³2025-12-16: 35.3 µg/m³2025-12-17: 33.2 µg/m³2025-12-18: 32.8 µg/m³2025-12-19: 31.3 µg/m³2025-12-20: 24.2 µg/m³2025-12-21: 6.4 µg/m³2025-12-22: 9.1 µg/m³2025-12-23: 16.3 µg/m³2025-12-24: 1.0 µg/m³2025-12-25: 1.1 µg/m³2025-12-26: 1.1 µg/m³2025-12-27: 9.0 µg/m³2025-12-28: 23.5 µg/m³2025-12-29: 29.9 µg/m³2025-12-30: 37.5 µg/m³2025-12-31: 40.8 µg/m³2026-01-01: 15.1 µg/m³2026-01-02: 4.6 µg/m³2026-01-03: 5.2 µg/m³2026-01-04: 5.2 µg/m³2026-01-05: 1.4 µg/m³2026-01-06: 4.5 µg/m³2026-01-07: 23.0 µg/m³2026-01-08: 8.8 µg/m³2026-01-09: 7.9 µg/m³2026-01-10: 20.5 µg/m³2026-01-11: 37.2 µg/m³2026-01-12: 48.5 µg/m³2026-01-13: 49.6 µg/m³2026-01-14: 62.0 µg/m³2026-01-15: 62.1 µg/m³2026-01-16: 59.0 µg/m³2026-01-17: 45.2 µg/m³2026-01-18: 38.6 µg/m³2026-01-19: 39.5 µg/m³2026-01-20: 38.0 µg/m³2026-01-21: 34.0 µg/m³2026-01-22: 32.9 µg/m³2026-01-23: 37.9 µg/m³2026-01-24: 31.1 µg/m³2026-01-25: 32.6 µg/m³2026-01-26: 40.3 µg/m³2026-01-27: 40.0 µg/m³2026-01-28: 43.6 µg/m³2026-01-29: 40.5 µg/m³2026-01-30: 49.2 µg/m³2026-01-31: 54.1 µg/m³2026-02-01: 56.2 µg/m³2026-02-02: 54.6 µg/m³2026-02-03: 46.7 µg/m³2026-02-04: 49.8 µg/m³2026-02-05: 50.2 µg/m³2026-02-06: 39.7 µg/m³2026-02-07: 34.8 µg/m³2026-02-08: 42.7 µg/m³2026-02-09: 30.8 µg/m³2026-02-10: 26.2 µg/m³2026-02-11: 2.7 µg/m³2026-02-12: 5.1 µg/m³2026-02-13: 9.4 µg/m³2026-02-14: 13.0 µg/m³2026-02-15: 6.1 µg/m³2026-02-16: 0.9 µg/m³2026-02-17: 0.5 µg/m³2026-02-18: 0.6 µg/m³2026-02-19: 0.5 µg/m³2026-02-20: 2.5 µg/m³2026-02-21: 7.0 µg/m³2026-02-22: 10.2 µg/m³2026-02-23: 12.2 µg/m³2026-02-24: 18.3 µg/m³2026-02-25: 21.9 µg/m³2026-02-26: 19.9 µg/m³2026-02-27: 31.0 µg/m³2026-02-28: 34.9 µg/m³2026-03-01: 20.8 µg/m³2026-03-02: 8.1 µg/m³2026-03-03: 13.3 µg/m³2026-03-04: 13.0 µg/m³2026-03-05: 5.4 µg/m³2026-03-06: 7.8 µg/m³2026-03-07: 14.1 µg/m³2026-03-08: 14.1 µg/m³2026-03-09: 7.4 µg/m³2026-03-10: 10.8 µg/m³2026-03-11: 14.4 µg/m³2026-03-12: 18.8 µg/m³2026-03-13: 31.3 µg/m³2026-03-14: 26.2 µg/m³2026-03-15: 15.0 µg/m³2026-03-16: 21.5 µg/m³2026-03-17: 34.3 µg/m³2026-03-18: 39.7 µg/m³2026-03-19: 33.7 µg/m³2026-03-20: 38.7 µg/m³2026-03-21: 37.0 µg/m³2026-03-22: 27.4 µg/m³2026-03-23: 22.7 µg/m³2026-03-24: 12.9 µg/m³2026-03-25: 15.8 µg/m³2026-03-26: 8.8 µg/m³2026-03-27: 14.6 µg/m³2026-03-28: 22.6 µg/m³2026-03-29: 20.3 µg/m³2026-03-30: 14.5 µg/m³2026-03-31: 12.1 µg/m³2026-04-01: 12.0 µg/m³2026-04-02: 2.0 µg/m³2026-04-03: 5.3 µg/m³2026-04-04: 8.4 µg/m³2026-04-05: 6.7 µg/m³2026-04-06: 4.1 µg/m³2026-04-07: 9.1 µg/m³2026-04-08: 7.7 µg/m³2026-04-09: 4.6 µg/m³2026-04-10: 0.3 µg/m³2026-04-11: 0.4 µg/m³2026-04-12: 0.4 µg/m³2026-04-13: 3.8 µg/m³2026-04-14: 7.7 µg/m³2026-04-15: 7.3 µg/m³2026-04-16: 5.7 µg/m³2026-04-17: 5.5 µg/m³2026-04-18: 7.4 µg/m³2026-04-19: 3.5 µg/m³2026-04-20: 1.2 µg/m³2026-04-21: 2.2 µg/m³2026-04-22: 6.8 µg/m³2026-04-23: 5.2 µg/m³2026-04-24: 7.7 µg/m³2026-04-25: 3.8 µg/m³2026-04-26: 5.1 µg/m³2026-04-27: 8.7 µg/m³2026-04-28: 13.4 µg/m³2026-04-29: 12.6 µg/m³2026-04-30: 11.5 µg/m³2026-05-01: 12.4 µg/m³2026-05-02: 7.4 µg/m³2026-05-03: 4.1 µg/m³2026-05-04: 2.6 µg/m³2026-05-05: 7.9 µg/m³2026-05-06: 17.7 µg/m³2026-05-07: 23.6 µg/m³2026-05-08: 12.8 µg/m³2026-05-09: 7.5 µg/m³2026-05-10: 12.9 µg/m³2026-05-11: 11.6 µg/m³2026-05-12: 6.5 µg/m³2026-05-13: 4.0 µg/m³2026-05-14: 3.8 µg/m³2026-05-15: 4.5 µg/m³2026-05-16: 6.0 µg/m³2026-05-17: 5.3 µg/m³2026-05-18: 1.9 µg/m³2026-05-19: 4.7 µg/m³2026-05-20: 4.6 µg/m³2026-05-21: 6.3 µg/m³2026-05-22: 6.1 µg/m³2026-05-23: 4.4 µg/m³2026-05-24: 5.1 µg/m³2026-05-25: 4.1 µg/m³2026-05-26: 5.8 µg/m³2026-05-27: 1.0 µg/m³2026-05-28: 2.0 µg/m³2026-05-29: 4.3 µg/m³2026-05-30: 13.8 µg/m³2026-05-31: 7.9 µg/m³2026-06-01: 13.9 µg/m³2026-06-02: 7.0 µg/m³2026-06-03: 6.3 µg/m³2026-06-04: 3.9 µg/m³2026-06-05: 5.7 µg/m³2026-06-06: 2.7 µg/m³2026-06-07: 1.5 µg/m³2026-06-08: 2.1 µg/m³2026-06-09: 0.8 µg/m³2026-06-10: 2.7 µg/m³2026-06-11: 5.1 µg/m³2026-06-12: 4.9 µg/m³2026-06-13: 3.6 µg/m³2026-06-14: 2.1 µg/m³2026-06-15: 3.9 µg/m³2026-06-16: 5.1 µg/m³2026-06-17: 4.1 µg/m³2026-06-18: 3.0 µg/m³2026-06-19: 4.1 µg/m³2026-06-20: 3.6 µg/m³2026-06-21: 3.6 µg/m³2026-06-22: 4.5 µg/m³2026-06-23: 6.1 µg/m³2026-06-24: 4.8 µg/m³2026-06-25: 5.1 µg/m³2026-06-26: 3.4 µg/m³2026-06-27: 1.3 µg/m³2026-06-28: 0.9 µg/m³2026-06-29: 1.9 µg/m³2026-06-30: 1.8 µg/m³2026-07-01: 1.5 µg/m³2026-07-02: 3.5 µg/m³2026-07-03: 4.3 µg/m³2026-07-04: 5.1 µg/m³2026-07-05: 2.7 µg/m³2026-07-06: 3.6 µg/m³2026-07-07: 2.9 µg/m³2026-07-08: 4.4 µg/m³2026-07-09: 6.9 µg/m³2026-07-10: 8.8 µg/m³2026-07-11: 3.4 µg/m³2026-07-12: 3.0 µg/m³2026-07-13: 4.9 µg/m³2026-07-14: 8.2 µg/m³2026-07-15: no data2026-07-16: 2.7 µg/m³2026-07-17: 2.6 µg/m³2026-07-18: 7.0 µg/m³2026-07-19: 4.1 µg/m³2026-07-20: 1.7 µg/m³2026-07-21: 2.9 µg/m³2026-07-22: 0.9 µg/m³2026-07-23: 1.2 µg/m³2026-07-24: 6.1 µg/m³2026-07-25: 3.0 µg/m³2026-07-26: 3.8 µg/m³2026-07-27: 4.2 µg/m³2026-07-28: 4.2 µg/m³2026-07-29: 4.6 µg/m³2026-07-30: 3.7 µg/m³2026-07-31: 3.3 µg/m³2026-08-01: 6.5 µg/m³2026-08-02: 7.5 µg/m³2026-08-03: 5.5 µg/m³2026-08-04: 3.9 µg/m³2026-08-05: 5.8 µg/m³2026-08-06: 8.3 µg/m³2026-08-07: 7.2 µg/m³2026-08-08: 5.2 µg/m³2026-08-09: 8.5 µg/m³2026-08-10: 4.5 µg/m³2026-08-11: 3.0 µg/m³2026-08-12: 5.6 µg/m³2026-08-13: 3.3 µg/m³2026-08-14: 5.0 µg/m³2026-08-15: 4.8 µg/m³2026-08-16: 9.3 µg/m³2026-08-17: 6.9 µg/m³2026-08-18: 7.7 µg/m³2026-08-19: 8.6 µg/m³2026-08-20: 10.1 µg/m³2026-08-21: 5.5 µg/m³2026-08-22: 3.3 µg/m³2026-08-23: 5.6 µg/m³2026-08-24: 8.8 µg/m³2026-08-25: 12.1 µg/m³2026-08-26: 12.5 µg/m³2026-08-27: 8.5 µg/m³2026-08-28: 9.9 µg/m³2026-08-29: 14.8 µg/m³2026-08-30: 9.2 µg/m³2026-08-31: 14.1 µg/m³2026-09-01: 14.9 µg/m³2026-09-02: 10.7 µg/m³2026-09-03: 7.3 µg/m³2026-09-04: 5.7 µg/m³2026-09-05: 3.7 µg/m³2026-09-06: 2.5 µg/m³2026-09-07: 2.8 µg/m³2026-09-08: 4.6 µg/m³2026-09-09: 6.3 µg/m³2026-09-10: 6.2 µg/m³2026-09-11: 3.0 µg/m³2026-09-12: 3.6 µg/m³2026-09-13: 6.6 µg/m³2026-09-14: 6.3 µg/m³2026-09-15: 7.2 µg/m³2026-09-16: 8.5 µg/m³2026-09-17: 7.1 µg/m³2026-09-18: 8.6 µg/m³2026-09-19: 9.8 µg/m³2026-09-20: 10.4 µg/m³2026-09-21: 6.8 µg/m³2026-09-22: 5.8 µg/m³2026-09-23: 12.6 µg/m³2026-09-24: 14.4 µg/m³2026-09-25: 5.8 µg/m³2026-09-26: 4.2 µg/m³2026-09-27: 2.0 µg/m³2026-09-28: 3.1 µg/m³2026-09-29: 4.8 µg/m³2026-09-30: 6.6 µg/m³
105 of 337 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: 4.4 µg/m³2026-10-01 01:00 UTC: 4.3 µg/m³2026-10-01 02:00 UTC: 4.3 µg/m³2026-10-01 03:00 UTC: 5.3 µg/m³2026-10-01 04:00 UTC: 7.3 µg/m³2026-10-01 05:00 UTC: 11.4 µg/m³2026-10-01 06:00 UTC: 11.7 µg/m³2026-10-01 07:00 UTC: 10.6 µg/m³2026-10-01 08:00 UTC: 9.8 µg/m³2026-10-01 09:00 UTC: 10.0 µg/m³2026-10-01 10:00 UTC: 9.5 µg/m³2026-10-01 12:00 UTC: 8.4 µg/m³2026-10-01 13:00 UTC: 8.8 µg/m³2026-10-01 14:00 UTC: 9.4 µg/m³2026-10-01 15:00 UTC: 10.0 µg/m³2026-10-01 16:00 UTC: 10.4 µg/m³2026-10-01 17:00 UTC: 8.8 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#2370NovDecJanFebMarAprMayJunJulAugSep
Rank on each day's board (1 = most polluted city that day).

2026 against 2025, month by month

15Jan 2026: 32.6 µg/m³JanFeb 2026: 22.4 µg/m³FebMar 2026: 19.3 µg/m³MarApr 2026: 6.0 µg/m³AprMay 2026: 7.2 µg/m³MayJun 2026: 4.0 µg/m³JunJul 2026: 4.0 µg/m³JulAug 2026: 7.5 µg/m³AugSep 2026: 6.7 µg/m³SepOctNov 2025: 23.9 µg/m³NovDec 2025: 26.0 µg/m³Dec
Faded bars: 2025. A month shows once it has 10 measured days.

Monitors

12 monitors: 0 reference, 12 low-cost
StationOperatorType
Delano WestCC BY 4.0SEEN/SEEDSLow-cost
Harvest & La Vina (DUESD)CC BY 4.0SJVAir.comLow-cost
Cecil Ave (DUESD)CC BY 4.0SJVAir.comLow-cost
Princeton Street (DUESD)CC BY 4.0SJVAir.comLow-cost
Terrace (DUESD)CC BY 4.0SJVAir.comLow-cost
Morningside (DUESD)CC BY 4.0SJVAir.comLow-cost
Del Vista (DUESD)CC BY 4.0SJVAir.comLow-cost
Almond Tree (DUESD)CC BY 4.0SJVAir.comLow-cost
Pioneer (DUESD)CC BY 4.0SJVAir.comLow-cost
Nueva Vista (DUESD)CC BY 4.0SJVAir.comLow-cost
Fremont (DUESD)CC BY 4.0SJVAir.comLow-cost
Albany Park (DUESD)CC BY 4.0SJVAir.comLow-cost

No reference monitor here, so the value is the median of low-cost sensors (at least two reporting each hour). Low-cost sensors can read high in humid air. 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.