SmogRank / Mexico / Oaxaca / Oaxaca

Oaxaca, month by month

Oaxaca has a measured daily mean on 38 days since 17 February 2026.

Every month since 2026

2026too few days for a mean (a year needs 199)38 days measured
JanFeb12 daysMarnoneAprnoneMay7 daysJun5 daysJul14 daysAugnoneSepnoneOctnone
Each square is a month's mean PM2.5 in US AQI from Oaxaca'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 Oaxaca marked; each year, the year's.
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

9 months
MonthWhy
Oct 2026No day measured. The others: 11 with no readings from the monitor.
Sep 2026No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 202614 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks.
Jun 20265 of 30 days measured; a month needs 21. The others: 25 with under 18 hours of readings or readings that failed our checks.
May 20267 of 31 days measured; a month needs 22. The others: 24 with under 18 hours of readings or readings that failed our checks.
Apr 2026No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Mar 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Feb 202612 of 28 days measured; a month needs 20.

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

Oaxaca's worst days

DayUS AQI
19 Feb 2026 9633.0 µg/m³
20 May 2026 9331.5 µg/m³
21 May 2026 8527.6 µg/m³
19 May 2026 8326.2 µg/m³
16 May 2026 7622.5 µg/m³
17 May 2026 7522.0 µg/m³
18 Feb 2026 7421.4 µg/m³
22 May 2026 7220.3 µg/m³
17 Feb 2026 7019.4 µg/m³
18 May 2026 6918.9 µg/m³

Daily means, the highest since 17 Feb 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, Oaxaca, Mexico, 17 Feb 2026 – 17 Jul 2026. Monitor data from Sinaica Mexico via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/mx/oaxaca/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.

Oaxaca 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).