SmogRank / United States / California / Livermore

Livermore, month by month

Livermore has a measured daily mean on 1,119 days since 1 January 2023. Its worst month was December 2024, at 53 US AQI (10.4 µg/m³), 842nd of 2,616 cities on that month's world ranking. Its cleanest was August 2025, at 18 US AQI (3.2 µg/m³). 2025 averaged 33 US AQI (5.9 µg/m³), against 36 US AQI (6.5 µg/m³) in 2023.

Every month since 2023

202638 so far256 days measured2,281st of 2,791 in the world
Jan47#1,358Feb37#2,298Mar33#2,540Apr27#2,525May20 daysJun39#1,423Jul33#2,421Aug45#1,572Sep39#1,272Oct46#907
202533 for the year343 days measured2,380th of 2,681 in the world
Jan52#1,086Feb32#2,180Mar34#2,260Apr44#1,762May34#1,903Jun38#2,025Jul18#2,830Aug18#2,866Sep22#2,940Oct24#2,280Nov37#1,959Dec36#2,350
2024too few days for a mean (a year needs 257)187 days measured
Jan27#2,096Feb1 dayMar1 dayAprnoneMaynoneJunnoneJul11 daysAug44#1,232Sep36#1,367Oct32#1,592Nov39#1,653Dec53#842
202336 for the year333 days measured1,118th of 1,355 in the world
Jan27#1,112Feb39#921Mar23#851Apr26#1,393May25#1,478Jun28#1,414Jul44#855Aug45#985Sep51#726Oct35#1,384Nov19 daysDec52#796
Each square is a month's mean PM2.5 in US AQI from Livermore's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with Livermore marked; each year, the year's. A dashed square is the running month, so far.
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

Months without a mean, and why

8 months
MonthWhy
May 202620 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks.
Jul 202411 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks.
Jun 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
May 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Mar 20241 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks.
Feb 20241 of 29 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks.
Nov 202319 of 30 days measured; a month needs 21. The others: 11 with under 18 hours of readings or readings that failed our checks.

A day counts once 18 hours of it are measured; a month needs 70% of its days.

Livermore's worst months

MonthUS AQIDays measuredWorld rankEpisode
December 2024 5310.4 µg/m³30 of 31842ndof 2,616California and Oregon, United States, December 2024
December 2023 529.6 µg/m³25 of 31796thof 2,247–
January 2025 529.5 µg/m³31 of 311,086thof 2,474–
September 2023 519.3 µg/m³30 of 30726thof 2,176California and Oregon, United States, September 2023
January 2026 478.5 µg/m³31 of 311,358thof 2,617–
August 2023 458.1 µg/m³31 of 31985thof 1,980–

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.

Livermore's worst days

DayUS AQIEpisode
20 Sept 2023 11943.0 µg/m³California and Oregon, United States, September 2023
21 Sept 2023 8828.7 µg/m³California and Oregon, United States, September 2023
22 Sept 2023 8628.0 µg/m³California and Oregon, United States, September 2023
11 Dec 2024 8225.6 µg/m³California and Oregon, United States, December 2024
31 Aug 2023 7823.5 µg/m³–
15 Dec 2023 7723.3 µg/m³–
23 Sept 2023 7722.8 µg/m³California and Oregon, United States, September 2023
7 Dec 2024 7522.2 µg/m³California and Oregon, United States, December 2024
16 Dec 2023 7521.9 µg/m³–
14 Dec 2023 7421.3 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, Livermore, United States, 1 Jan 2023 – 10 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/livermore/history (accessed 12 Oct 2026).

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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.

Livermore now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-12 20:07 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).