SmogRank / United States / California / Lompoc
Lompoc, month by month
Lompoc has a measured daily mean on 1,283 days since 1 January 2023. Its worst month was September 2023, at 55 US AQI (11.3 µg/m³), 395th of 2,176 cities on that month's world ranking. Its cleanest was January 2026, at 10 US AQI (1.8 µg/m³). 2025 averaged 34 US AQI (6.1 µg/m³), against 27 US AQI (4.8 µg/m³) in 2024.
Every month since 2023
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
Lompoc's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| September 2023 | 5511.3 µg/m³ | 395thof 2,176 | California and Oregon, United States, September 2023 |
| May 2025 | 529.4 µg/m³ | 1,004thof 2,826 | – |
| June 2025 | 468.3 µg/m³ | 1,760thof 2,508 | – |
| August 2025 | 437.8 µg/m³ | 1,882ndof 2,901 | – |
| November 2024 | 427.5 µg/m³ | 1,518thof 2,624 | – |
| April 2025 | 427.5 µg/m³ | 1,890thof 2,951 | – |
Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.
Lompoc's worst days
| Day | US AQI | Episode |
|---|---|---|
| 21 Sept 2023 | 9432.3 µg/m³ | California and Oregon, United States, September 2023 |
| 20 Sept 2023 | 9030.0 µg/m³ | California and Oregon, United States, September 2023 |
| 22 Sept 2023 | 8829.0 µg/m³ | California and Oregon, United States, September 2023 |
| 23 Sept 2023 | 8225.8 µg/m³ | California and Oregon, United States, September 2023 |
| 29 Aug 2023 | 7421.6 µg/m³ | – |
| 1 Sept 2023 | 7119.8 µg/m³ | – |
| 24 Sept 2023 | 6918.7 µg/m³ | California and Oregon, United States, September 2023 |
| 8 Nov 2024 | 6818.0 µg/m³ | – |
| 7 Nov 2024 | 6717.8 µg/m³ | – |
| 21 May 2025 | 6516.4 µg/m³ | – |
Daily means, the highest since 1 Jan 2023; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.
Use this history
SmogRank, PM2.5 monthly and daily means, Lompoc, United States, 1 Jan 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/lompoc/history (accessed 12 Oct 2026).
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.
Lompoc now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 17:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).