SmogRank / United States / California

Air quality in Ben Lomond

California, United States. Over the last 24 hours its air rated Good, the 551st most polluted of 1,339 cities measured.

24-hour average46US AQI
Good

PM2.5 8.2 µg/m³, 0.5× the WHO 24-hour guideline. The figure the 24-hour ranking uses.

Latest hour: 58 US AQI (13.0 µg/m³), local time

About 1.7× its usual for early October (4.9 µg/m³).

Where Ben Lomond ranks

24 hours#551of 1,339, at 46 US AQI (8.2 µg/m³)
7 days#676of 2,676, at 52 US AQI (9.7 µg/m³)
30 days#854of 2,887, at 48 US AQI (8.6 µg/m³)
This year#2,293of 2,735, at 37 US AQI (6.7 µg/m³)

Bad-air episodes that reached Ben Lomond

Times when Ben Lomond and many cities around it had PM2.5 at twice their usual or more on the same days. All episodes.

The last 12 months, day by day

1102031Nov 2025DecJan 2026FebMarAprMayJunJulAugSepOct2025-11-01: 4.9 µg/m³2025-11-02: 4.6 µg/m³2025-11-03: 3.0 µg/m³2025-11-04: 2.7 µg/m³2025-11-05: 1.9 µg/m³2025-11-06: 2.7 µg/m³2025-11-07: 3.2 µg/m³2025-11-08: 3.3 µg/m³2025-11-09: 4.2 µg/m³2025-11-10: 2.3 µg/m³2025-11-11: 1.9 µg/m³2025-11-12: 1.4 µg/m³2025-11-13: 0.0 µg/m³2025-11-14: 2.7 µg/m³2025-11-15: no daily value, under 18 hours of readings, or readings that failed our checks2025-11-16: 1.0 µg/m³2025-11-17: 0.5 µg/m³2025-11-18: 1.5 µg/m³2025-11-19: no daily value, under 18 hours of readings, or readings that failed our checks2025-11-20: 0.1 µg/m³2025-11-21: 1.4 µg/m³2025-11-22: 5.7 µg/m³2025-11-23: 6.0 µg/m³2025-11-24: 2.1 µg/m³2025-11-25: 6.0 µg/m³2025-11-26: no daily value, under 18 hours of readings, or readings that failed our checks2025-11-27: 6.4 µg/m³2025-11-28: 8.5 µg/m³2025-11-29: 9.0 µg/m³2025-11-30: 8.8 µg/m³2025-12-01: 5.9 µg/m³2025-12-02: 7.5 µg/m³2025-12-03: 9.1 µg/m³2025-12-04: 8.3 µg/m³2025-12-05: 10.2 µg/m³2025-12-06: 13.9 µg/m³2025-12-07: 9.2 µg/m³2025-12-08: 11.4 µg/m³2025-12-09: 12.0 µg/m³2025-12-10: 13.1 µg/m³2025-12-11: 10.4 µg/m³2025-12-12: 11.4 µg/m³2025-12-13: 10.9 µg/m³2025-12-14: 3.0 µg/m³2025-12-15: 2.7 µg/m³2025-12-16: 7.0 µg/m³2025-12-17: 5.7 µg/m³2025-12-18: 3.0 µg/m³2025-12-19: 2.6 µg/m³2025-12-20: no daily value, under 18 hours of readings, or readings that failed our checks2025-12-21: no daily value, under 18 hours of readings, or readings that failed our checks2025-12-22: 0.2 µg/m³2025-12-23: 1.0 µg/m³2025-12-24: 1.0 µg/m³2025-12-25: 2.7 µg/m³2025-12-26: 1.0 µg/m³2025-12-27: 2.7 µg/m³2025-12-28: 4.7 µg/m³2025-12-29: 6.9 µg/m³2025-12-30: 8.0 µg/m³2025-12-31: no daily value, under 18 hours of readings, or readings that failed our checks2026-01-01: 0.0 µg/m³2026-01-02: no daily value, under 18 hours of readings, or readings that failed our checks2026-01-03: no daily value, under 18 hours of readings, or readings that failed our checks2026-01-04: no daily value, under 18 hours of readings, or readings that failed our checks2026-01-05: 1.0 µg/m³2026-01-06: no daily value, under 18 hours of readings, or readings that failed our checks2026-01-07: 0.7 µg/m³2026-01-08: 4.8 µg/m³2026-01-09: 4.2 µg/m³2026-01-10: 8.4 µg/m³2026-01-11: 13.2 µg/m³2026-01-12: 13.9 µg/m³2026-01-13: 12.3 µg/m³2026-01-14: 11.3 µg/m³2026-01-15: 11.3 µg/m³2026-01-16: 11.9 µg/m³2026-01-17: 10.8 µg/m³2026-01-18: 12.2 µg/m³2026-01-19: 10.1 µg/m³2026-01-20: 8.4 µg/m³2026-01-21: 5.8 µg/m³2026-01-22: 3.3 µg/m³2026-01-23: 3.4 µg/m³2026-01-24: 6.2 µg/m³2026-01-25: 11.9 µg/m³2026-01-26: 11.3 µg/m³2026-01-27: 12.3 µg/m³2026-01-28: 4.6 µg/m³2026-01-29: 4.2 µg/m³2026-01-30: 5.0 µg/m³2026-01-31: 8.4 µg/m³2026-02-01: 7.7 µg/m³2026-02-02: 8.5 µg/m³2026-02-03: 10.3 µg/m³2026-02-04: 8.9 µg/m³2026-02-05: 7.0 µg/m³2026-02-06: 5.9 µg/m³2026-02-07: 8.7 µg/m³2026-02-08: 5.5 µg/m³2026-02-09: no daily value, under 18 hours of readings, or readings that failed our checks2026-02-10: no daily value, under 18 hours of readings, or readings that failed our checks2026-02-11: no daily value, under 18 hours of readings, or readings that failed our checks2026-02-12: 3.9 µg/m³2026-02-13: 4.7 µg/m³2026-02-14: 3.4 µg/m³2026-02-15: 1.7 µg/m³2026-02-16: 1.7 µg/m³2026-02-17: 2.1 µg/m³2026-02-18: 3.3 µg/m³2026-02-19: 2.8 µg/m³2026-02-20: 5.8 µg/m³2026-02-21: 5.0 µg/m³2026-02-22: 9.7 µg/m³2026-02-23: 7.3 µg/m³2026-02-24: 2.5 µg/m³2026-02-25: 1.5 µg/m³2026-02-26: 1.8 µg/m³2026-02-27: 2.9 µg/m³2026-02-28: 1.8 µg/m³2026-03-01: 2.5 µg/m³2026-03-02: 2.2 µg/m³2026-03-03: 2.4 µg/m³2026-03-04: 3.6 µg/m³2026-03-05: 5.3 µg/m³2026-03-06: 4.7 µg/m³2026-03-07: 6.6 µg/m³2026-03-08: 6.6 µg/m³2026-03-09: 5.0 µg/m³2026-03-10: 7.4 µg/m³2026-03-11: 5.6 µg/m³2026-03-12: 8.5 µg/m³2026-03-13: 5.8 µg/m³2026-03-14: 6.1 µg/m³2026-03-15: 4.1 µg/m³2026-03-16: 4.6 µg/m³2026-03-17: 7.6 µg/m³2026-03-18: 6.8 µg/m³2026-03-19: 6.2 µg/m³2026-03-20: 6.8 µg/m³2026-03-21: 7.2 µg/m³2026-03-22: 9.8 µg/m³2026-03-23: 5.6 µg/m³2026-03-24: 6.3 µg/m³2026-03-25: 5.1 µg/m³2026-03-26: 5.0 µg/m³2026-03-27: 6.9 µg/m³2026-03-28: 8.7 µg/m³2026-03-29: 7.7 µg/m³2026-03-30: 6.7 µg/m³2026-03-31: 6.5 µg/m³2026-04-01: 4.1 µg/m³2026-04-02: 4.3 µg/m³2026-04-03: 5.9 µg/m³2026-04-04: 5.6 µg/m³2026-04-05: 6.1 µg/m³2026-04-06: 6.5 µg/m³2026-04-07: 7.8 µg/m³2026-04-08: 8.8 µg/m³2026-04-09: no daily value, under 18 hours of readings, or readings that failed our checks2026-04-10: no daily value, under 18 hours of readings, or readings that failed our checks2026-04-11: no daily value, under 18 hours of readings, or readings that failed our checks2026-04-12: no daily value, under 18 hours of readings, or readings that failed our checks2026-04-13: 1.5 µg/m³2026-04-14: 4.4 µg/m³2026-04-15: 7.2 µg/m³2026-04-16: 5.0 µg/m³2026-04-17: 7.9 µg/m³2026-04-18: 6.8 µg/m³2026-04-19: no daily value, under 18 hours of readings, or readings that failed our checks2026-04-20: 3.7 µg/m³2026-04-21: 1.6 µg/m³2026-04-22: 2.2 µg/m³2026-04-23: 3.1 µg/m³2026-04-24: 9.0 µg/m³2026-04-25: 4.5 µg/m³2026-04-26: 5.7 µg/m³2026-04-27: 8.1 µg/m³2026-04-28: 8.6 µg/m³2026-04-29: 7.0 µg/m³2026-04-30: 8.6 µg/m³2026-05-01: 7.8 µg/m³2026-05-02: 5.5 µg/m³2026-05-03: 2.4 µg/m³2026-05-04: 3.3 µg/m³2026-05-05: 2.5 µg/m³2026-05-06: 3.2 µg/m³2026-05-07: 3.8 µg/m³2026-05-08: 5.3 µg/m³2026-05-09: 7.7 µg/m³2026-05-10: 6.3 µg/m³2026-05-11: 6.3 µg/m³2026-05-12: 3.9 µg/m³2026-05-13: 4.0 µg/m³2026-05-14: 7.3 µg/m³2026-05-15: 9.6 µg/m³2026-05-16: 10.5 µg/m³2026-05-17: 10.0 µg/m³2026-05-18: 4.6 µg/m³2026-05-19: 6.1 µg/m³2026-05-20: 13.3 µg/m³2026-05-21: 9.9 µg/m³2026-05-22: 3.5 µg/m³2026-05-23: 5.7 µg/m³2026-05-24: 6.2 µg/m³2026-05-25: 3.2 µg/m³2026-05-26: no daily value, under 18 hours of readings, or readings that failed our checks2026-05-27: no daily value, under 18 hours of readings, or readings that failed our checks2026-05-28: 3.9 µg/m³2026-05-29: 4.5 µg/m³2026-05-30: 4.9 µg/m³2026-05-31: 11.6 µg/m³2026-06-01: 11.9 µg/m³2026-06-02: 9.9 µg/m³2026-06-03: 7.8 µg/m³2026-06-04: 9.3 µg/m³2026-06-05: 15.7 µg/m³2026-06-06: 8.1 µg/m³2026-06-07: 10.3 µg/m³2026-06-08: 6.2 µg/m³2026-06-09: 2.9 µg/m³2026-06-10: 7.1 µg/m³2026-06-11: 10.3 µg/m³2026-06-12: 6.9 µg/m³2026-06-13: 4.6 µg/m³2026-06-14: 5.6 µg/m³2026-06-15: 6.1 µg/m³2026-06-16: 4.7 µg/m³2026-06-17: 4.4 µg/m³2026-06-18: 1.8 µg/m³2026-06-19: 3.2 µg/m³2026-06-20: 2.1 µg/m³2026-06-21: 3.8 µg/m³2026-06-22: 5.9 µg/m³2026-06-23: 4.8 µg/m³2026-06-24: 4.4 µg/m³2026-06-25: 6.7 µg/m³2026-06-26: 2.2 µg/m³2026-06-27: 1.7 µg/m³2026-06-28: 8.0 µg/m³2026-06-29: 7.1 µg/m³2026-06-30: 8.4 µg/m³2026-07-01: 8.1 µg/m³2026-07-02: 8.3 µg/m³2026-07-03: 6.0 µg/m³2026-07-04: 6.0 µg/m³2026-07-05: 3.9 µg/m³2026-07-06: 4.1 µg/m³2026-07-07: 4.9 µg/m³2026-07-08: no daily value, under 18 hours of readings, or readings that failed our checks2026-07-09: no daily value, under 18 hours of readings, or readings that failed our checks2026-07-10: 8.3 µg/m³2026-07-11: 6.9 µg/m³2026-07-12: 6.0 µg/m³2026-07-13: 5.4 µg/m³2026-07-14: 7.3 µg/m³2026-07-15: 7.8 µg/m³2026-07-16: 7.7 µg/m³2026-07-17: 9.4 µg/m³2026-07-18: 6.6 µg/m³2026-07-19: 5.4 µg/m³2026-07-20: 5.3 µg/m³2026-07-21: 3.6 µg/m³2026-07-22: 3.4 µg/m³2026-07-23: 4.3 µg/m³2026-07-24: 3.5 µg/m³2026-07-25: 5.0 µg/m³2026-07-26: 5.0 µg/m³2026-07-27: 3.6 µg/m³2026-07-28: 6.1 µg/m³2026-07-29: 7.5 µg/m³2026-07-30: 9.2 µg/m³2026-07-31: 9.2 µg/m³2026-08-01: 9.3 µg/m³2026-08-02: 11.5 µg/m³2026-08-03: 13.0 µg/m³2026-08-04: 10.0 µg/m³2026-08-05: 9.7 µg/m³2026-08-06: 10.7 µg/m³2026-08-07: 11.0 µg/m³2026-08-08: 10.0 µg/m³2026-08-09: 10.0 µg/m³2026-08-10: 8.7 µg/m³2026-08-11: 9.8 µg/m³2026-08-12: 7.2 µg/m³2026-08-13: 5.1 µg/m³2026-08-14: 4.6 µg/m³2026-08-15: 7.0 µg/m³2026-08-16: 7.0 µg/m³2026-08-17: 8.0 µg/m³2026-08-18: 7.4 µg/m³2026-08-19: 9.3 µg/m³2026-08-20: 7.7 µg/m³2026-08-21: 5.7 µg/m³2026-08-22: 5.5 µg/m³2026-08-23: 7.0 µg/m³2026-08-24: 5.7 µg/m³2026-08-25: 4.4 µg/m³2026-08-26: 5.4 µg/m³2026-08-27: 5.6 µg/m³2026-08-28: 5.0 µg/m³2026-08-29: 7.0 µg/m³2026-08-30: 9.5 µg/m³2026-08-31: 7.8 µg/m³2026-09-01: 6.2 µg/m³2026-09-02: 6.1 µg/m³2026-09-03: 6.6 µg/m³2026-09-04: 6.4 µg/m³2026-09-05: 7.0 µg/m³2026-09-06: 8.0 µg/m³2026-09-07: 6.8 µg/m³2026-09-08: 8.0 µg/m³2026-09-09: 7.1 µg/m³2026-09-10: 8.1 µg/m³2026-09-11: 10.5 µg/m³2026-09-12: 9.0 µg/m³2026-09-13: 8.0 µg/m³2026-09-14: 6.2 µg/m³2026-09-15: 10.8 µg/m³2026-09-16: 11.3 µg/m³2026-09-17: 10.1 µg/m³2026-09-18: 8.0 µg/m³2026-09-19: 9.5 µg/m³2026-09-20: 9.8 µg/m³2026-09-21: 6.5 µg/m³2026-09-22: 6.8 µg/m³2026-09-23: 6.9 µg/m³2026-09-24: 10.9 µg/m³2026-09-25: 6.4 µg/m³2026-09-26: 7.8 µg/m³2026-09-27: 10.1 µg/m³2026-09-28: 10.7 µg/m³2026-09-29: 11.3 µg/m³2026-09-30: 11.0 µg/m³2026-10-01: 8.1 µg/m³2026-10-02: 8.6 µg/m³2026-10-03: 7.9 µg/m³
1 of 338 measured days were over the WHO 24-hour guideline (15 µg/m³). 27 days without a value, all with under 18 hours of readings or readings that failed our checks; point at a grey square for its reason (why days go blank). One row per month, one square per local day.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Last 4 days, hour by hour

15303 Oct 18:00 local, 2026-10-04 01:00 UTC: 10.0 µg/m³3 Oct 19:00 local, 2026-10-04 02:00 UTC: 9.0 µg/m³3 Oct 20:00 local, 2026-10-04 03:00 UTC: 12.0 µg/m³3 Oct 21:00 local, 2026-10-04 04:00 UTC: 12.0 µg/m³3 Oct 22:00 local, 2026-10-04 05:00 UTC: 13.0 µg/m³3 Oct 23:00 local, 2026-10-04 06:00 UTC: 11.0 µg/m³4 Oct 00:00 local, 2026-10-04 07:00 UTC: 12.0 µg/m³4 Oct 01:00 local, 2026-10-04 08:00 UTC: 10.0 µg/m³4 Oct 02:00 local, 2026-10-04 09:00 UTC: 7.0 µg/m³4 Oct 03:00 local, 2026-10-04 10:00 UTC: 9.0 µg/m³4 Oct 04:00 local, 2026-10-04 11:00 UTC: 6.0 µg/m³4 Oct 06:00 local, 2026-10-04 13:00 UTC: 7.0 µg/m³4 Oct 07:00 local, 2026-10-04 14:00 UTC: 8.0 µg/m³4 Oct 08:00 local, 2026-10-04 15:00 UTC: 7.0 µg/m³4 Oct 09:00 local, 2026-10-04 16:00 UTC: 6.0 µg/m³4 Oct 10:00 local, 2026-10-04 17:00 UTC: 3.0 µg/m³4 Oct 11:00 local, 2026-10-04 18:00 UTC: 3.0 µg/m³4 Oct 12:00 local, 2026-10-04 19:00 UTC: 4.0 µg/m³4 Oct 13:00 local, 2026-10-04 20:00 UTC: 4.0 µg/m³4 Oct 14:00 local, 2026-10-04 21:00 UTC: 4.0 µg/m³4 Oct 15:00 local, 2026-10-04 22:00 UTC: 6.0 µg/m³4 Oct 16:00 local, 2026-10-04 23:00 UTC: 10.0 µg/m³4 Oct 17:00 local, 2026-10-05 00:00 UTC: 10.0 µg/m³4 Oct 18:00 local, 2026-10-05 01:00 UTC: 13.0 µg/m³4 Oct 19:00 local, 2026-10-05 02:00 UTC: 15.0 µg/m³4 Oct 20:00 local, 2026-10-05 03:00 UTC: 13.0 µg/m³Oct 1Oct 2Oct 3Oct 4
Ben Lomond's local time; hover a bar for UTC. Dashed line: WHO 24-hour guideline (15 µg/m³).

Where it stood each day

Top 10Top 100#1#10#100#1,000#3,193NovDecJanFebMarAprMayJunJulAugSep#854
Its rank on each day's world board, #1 being the most polluted city that day. Higher is worse. Each gridline down is ten times the rank above it (#1, #10, #100, #1,000), so the top places get the most room. See it among every city.

2026 against 2025, month by month

15Jan 2025: 13.4 µg/m³Jan 2026: 7.8 µg/m³JanFeb 2025: 5.4 µg/m³Feb 2026: 5.0 µg/m³FebMar 2025: 3.8 µg/m³Mar 2026: 5.9 µg/m³MarApr 2025: 4.7 µg/m³Apr 2026: 5.8 µg/m³AprMay 2025: 5.9 µg/m³May 2026: 6.1 µg/m³MayJun 2025: 7.1 µg/m³Jun 2026: 6.4 µg/m³JunJul 2025: 3.6 µg/m³Jul 2026: 6.1 µg/m³JulAug 2025: 4.9 µg/m³Aug 2026: 7.9 µg/m³AugSep 2025: 4.0 µg/m³Sep 2026: 8.4 µg/m³SepOct 2025: 2.8 µg/m³OctNov 2025: 3.5 µg/m³NovDec 2025: 6.6 µg/m³Dec
Faded bars: 2025. A month shows once it has 10 measured days.

This week against past years

This weekThis week: 9.7 µg/m³9.720252025: 2.7 µg/m³2.720242024: 7.0 µg/m³7.020232023: 3.7 µg/m³3.7
Mean PM2.5 for 27 Sept to 3 Oct in each year. Dashed line: WHO 24-hour guideline.

Monitors

PM2.5 from 1 reference monitor, updated hourly.

StationOperatorType
SLV Middle School AMUS Public DomainAirNowReference

The city's value is the median of its reference monitors each hour, when at least a third of them report (three are always enough); 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.

Use this page

SmogRank, PM2.5 daily means, Ben Lomond, United States, 4 Oct 2025 – 3 Oct 2026, smogrank.com/us/ben-lomond (accessed 5 Oct 2026).

Download chart (PNG)Embed a live widget

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

Other cities in United States

30-day averages, US AQI. All of United States.

Updated 2026-10-05 04:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.