SmogRank / Mexico / Morelos / Cuernavaca

Cuernavaca, month by month

Cuernavaca has a measured daily mean on 609 days since 10 January 2023. Its worst month was April 2025, at 86 US AQI (28.0 µg/m³), 193rd of 2,951 cities on that month's world ranking. Its cleanest was July 2026, at 54 US AQI (10.6 µg/m³).

Every month since 2023

202662 so far233 days measured573rd of 2,791 in the world
Jan67#581Feb71#563Mar67#686Apr64#512May10 daysJun54#576Jul54#1,211Aug56#599Sep9 daysOct46#931
2025too few days for a mean (a year needs 256)142 days measured
JannoneFebnoneMar17 daysApr86#193May3 daysJunnoneJulnoneAugnoneSep68#257Oct58#407Nov16 daysDec74#455
2024too few days for a mean (a year needs 257)23 days measured
Jan6 daysFeb1 dayMar2 daysApr5 daysMay1 dayJun4 daysJul1 dayAugnoneSepnoneOct1 dayNov2 daysDecnone
2023too few days for a mean (a year needs 256)211 days measured
Jan13 daysFeb1 dayMar7 daysApr76#88May7 daysJun6 daysJul20 daysAug62#191Sep67#129Oct17 daysNov55#398Dec64#254
Each square is a month's mean PM2.5 in US AQI from Cuernavaca'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 Cuernavaca 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

29 months
MonthWhy
Sep 20269 of 30 days measured; a month needs 21. The others: 1 with readings for part of the day (a day needs 18 hours), 20 with under 18 hours of readings or readings that failed our checks.
May 202610 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Nov 202516 of 30 days measured; a month needs 21. The others: 14 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 20253 of 31 days measured; a month needs 22. The others: 28 with under 18 hours of readings or readings that failed our checks.
Mar 202517 of 31 days measured; a month needs 22. The others: 14 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 20242 of 30 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks.
Oct 20241 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks.
Sep 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 20241 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks.
Jun 20244 of 30 days measured; a month needs 21. The others: 26 with under 18 hours of readings or readings that failed our checks.
May 20241 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks.
Apr 20245 of 30 days measured; a month needs 21. The others: 25 with under 18 hours of readings or readings that failed our checks.
Mar 20242 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks.
Feb 20241 of 29 days measured; a month needs 21. The others: 1 missing from OpenAQ's archive, 27 with under 18 hours of readings or readings that failed our checks.
Jan 20246 of 31 days measured; a month needs 22. The others: 25 with under 18 hours of readings or readings that failed our checks.
Oct 202317 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.
Jul 202320 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 10 with under 18 hours of readings or readings that failed our checks.
Jun 20236 of 30 days measured; a month needs 21. The others: 24 with under 18 hours of readings or readings that failed our checks.
May 20237 of 31 days measured; a month needs 22. The others: 24 with under 18 hours of readings or readings that failed our checks.
Mar 20237 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive, 4 with under 18 hours of readings or readings that failed our checks.
Feb 20231 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive, 2 with under 18 hours of readings or readings that failed our checks.
Jan 202313 of 31 days measured; a month needs 22. The others: 6 missing from OpenAQ's archive, 3 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.

Cuernavaca's worst months

MonthUS AQIDays measuredWorld rank
April 2025 8628.0 µg/m³30 of 30193rdof 2,951
April 2023 7622.7 µg/m³27 of 3088thof 1,622
December 2025 7421.6 µg/m³24 of 31455thof 3,006
February 2026 7119.8 µg/m³28 of 28563rdof 2,866
September 2025 6818.1 µg/m³26 of 30257thof 3,104
September 2023 6717.8 µg/m³30 of 30129thof 2,176

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.

Cuernavaca's worst days

DayUS AQI
18 Dec 2025 190111.0 µg/m³
18 Apr 2025 14352.5 µg/m³
20 Apr 2025 13549.2 µg/m³
1 Sept 2023 12545.3 µg/m³
19 Apr 2025 12344.3 µg/m³
31 Aug 2023 11340.3 µg/m³
16 Apr 2025 11240.0 µg/m³
27 Apr 2023 11239.9 µg/m³
14 Apr 2025 10838.5 µg/m³
11 Apr 2025 10838.3 µg/m³

Daily means, the highest since 10 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, Cuernavaca, Mexico, 10 Jan 2023 – 11 Oct 2026. Monitor data from Sinaica Mexico via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/mx/cuernavaca/history (accessed 12 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.

Cuernavaca 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).