SmogRank / United States / California / Mecca

Mecca, month by month

Mecca, California has a measured daily mean on 86 days since 1 April 2026. Its worst month was May 2026, at 66 US AQI (16.9 µg/m³), 357th of 2,874 cities on that month's world ranking. Its cleanest was April 2026, at 37 US AQI (6.7 µg/m³).

Every month since 2026

2026too few days for a mean (a year needs 199)86 days measured
JanFebMarApr37#1,984May66#357JunnoneJulnoneAugnoneSep55#525Oct68#132
Each square is a month's mean PM2.5 in US AQI from Mecca'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 Mecca 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

3 months
MonthWhy
Aug 2026No day measured. The others: 30 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours).
Jul 2026No day measured. The others: 31 with no readings from the monitor.
Jun 2026No day measured. The others: 28 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours).

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

Mecca's worst months

MonthUS AQIDays measuredWorld rank
May 2026 6616.9 µg/m³22 of 31357thof 2,874
September 2026 5511.5 µg/m³29 of 30525thof 2,981
April 2026 376.7 µg/m³24 of 301,984thof 2,941

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.

Mecca's worst days

DayUS AQI
21 May 2026 14854.6 µg/m³
16 May 2026 13047.2 µg/m³
18 May 2026 9733.8 µg/m³
17 May 2026 9633.5 µg/m³
15 May 2026 8828.9 µg/m³
1 Oct 2026 8225.9 µg/m³
21 Apr 2026 8024.5 µg/m³
22 May 2026 7723.1 µg/m³
6 Oct 2026 7722.8 µg/m³
7 Oct 2026 7522.0 µg/m³

Daily means, the highest since 1 Apr 2026; 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, Mecca, California, United States, 1 Apr 2026 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/mecca/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.

Mecca 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).