SmogRank / United States / California / Elk Grove

Elk Grove, month by month

Elk Grove has a measured daily mean on 271 days since 26 April 2024. Its worst month was January 2026, at 79 US AQI (24.1 µg/m³), 268th of 2,617 cities on that month's world ranking. Its cleanest was May 2024, at 14 US AQI (2.5 µg/m³).

Every month since 2024

2026too few days for a mean (a year needs 199)112 days measured
Jan79#268Feb10 daysMar17 daysApr3 daysMay6 daysJun6 daysJul8 daysAug11 daysSep39#1,248Oct6 days
2025too few days for a mean (a year needs 256)58 days measured
JannoneFebnoneMarnoneAprnoneMaynoneJunnoneJulnoneAugnoneSep5 daysOct16 daysNov20 daysDec17 days
2024too few days for a mean (a year needs 257)101 days measured
JanFebMarApr5 daysMay14#2,631Jun24#2,326Jul44#1,348Aug17 daysSep3 daysOctnoneNovnoneDecnone
Each square is a month's mean PM2.5 in US AQI from Elk Grove'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 Elk Grove marked; each year, the year's.
Good0–50
Moderate51–100
Unhealthy for 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

26 months
MonthWhy
Oct 20266 of 11 days measured; a month needs 8. The others: 5 with readings for part of the day (a day needs 18 hours).
Aug 202611 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks.
Jul 20268 of 31 days measured; a month needs 22. The others: 23 with under 18 hours of readings or readings that failed our checks.
Jun 20266 of 30 days measured; a month needs 21. The others: 24 with under 18 hours of readings or readings that failed our checks.
May 20266 of 31 days measured; a month needs 22. The others: 25 with under 18 hours of readings or readings that failed our checks.
Apr 20263 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks.
Mar 202617 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.
Feb 202610 of 28 days measured; a month needs 20. The others: 18 with under 18 hours of readings or readings that failed our checks.
Dec 202517 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.
Nov 202520 of 30 days measured; a month needs 21. The others: 10 with under 18 hours of readings or readings that failed our checks.
Oct 202516 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks.
Sep 20255 of 30 days measured; a month needs 21. The others: 25 with under 18 hours of readings or readings that failed our checks.
Aug 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jun 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
May 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Mar 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Feb 2025No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks.
Jan 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Dec 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Nov 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Oct 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Sep 20243 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks.
Aug 202417 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.
Apr 20245 of 30 days measured; a month needs 21.

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

Elk Grove's worst months

MonthUS AQIDays measuredWorld rank
January 2026 7924.1 µg/m³22 of 31268thof 2,617
July 2024 448.0 µg/m³23 of 311,348thof 2,566
September 2026 397.1 µg/m³23 of 301,248thof 2,997
June 2024 244.4 µg/m³26 of 302,326thof 2,563
May 2024 142.5 µg/m³27 of 312,631stof 2,684

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.

Elk Grove's worst days

DayUS AQI
17 Jan 2026 11641.4 µg/m³
15 Jan 2026 10938.9 µg/m³
18 Jan 2026 10938.8 µg/m³
16 Jan 2026 10838.5 µg/m³
14 Jan 2026 10436.6 µg/m³
31 Jan 2026 9834.5 µg/m³
13 Jan 2026 9331.6 µg/m³
6 Feb 2026 9030.0 µg/m³
19 Jan 2026 8929.3 µg/m³
23 Jan 2026 8828.8 µg/m³

Daily means, the highest since 26 Apr 2024; 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, Elk Grove, United States, 26 Apr 2024 – 11 Oct 2026. Monitor data from Clarity and AirGradient via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/us/elk-grove/history (accessed 13 Oct 2026).

Download chart (PNG)

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.

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

Updated 2026-10-13 04:07 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).