SmogRank / Mexico / México / Naucalpan de Juárez

Naucalpan de Juárez, month by month

Naucalpan de Juárez has a measured daily mean on 701 days since 3 January 2023. Its worst month was May 2026, at 89 US AQI (29.6 µg/m³), 178th of 2,874 cities on that month's world ranking. Its cleanest was September 2025, at 62 US AQI (14.9 µg/m³).

Every month since 2023

202675 so far243 days measured317th of 2,798 in the world
Jan79#274Feb81#372Mar21 daysApr20 daysMay89#178Jun69#264Jul77#252Aug71#248Sep67#308Oct66#168
202573 for the year275 days measured229th of 2,681 in the world
Jan21 daysFeb10 daysMar21 daysApr13 daysMay80#197Jun72#219Jul21 daysAug65#295Sep62#344Oct66#317Nov74#372Dec78#385
2024too few days for a mean (a year needs 257)35 days measured
JannoneFebnoneMarnoneAprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOct4 daysNov14 daysDec17 days
2023too few days for a mean (a year needs 256)148 days measured
Jan15 daysFebnoneMar11 daysApr76#88May18 daysJun12 daysJul10 daysAug63#185Sep68#127OctnoneNovnoneDecnone
Each square is a month's mean PM2.5 in US AQI from Naucalpan de Juárez'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 Naucalpan de Juárez 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

28 months
MonthWhy
Apr 202620 of 30 days measured; a month needs 21. The others: 10 with under 18 hours of readings or readings that failed our checks.
Mar 202621 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Jul 202521 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Apr 202513 of 30 days measured; a month needs 21. The others: 17 with under 18 hours of readings or readings that failed our checks.
Mar 202521 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Feb 202510 of 28 days measured; a month needs 20. The others: 18 with under 18 hours of readings or readings that failed our checks.
Jan 202521 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Dec 202417 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.
Nov 202414 of 30 days measured; a month needs 21. The others: 16 with under 18 hours of readings or readings that failed our checks.
Oct 20244 of 31 days measured; a month needs 22. The others: 27 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 2024No day measured. The others: 31 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 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Feb 2024No day measured. The others: 1 missing from OpenAQ's archive, 28 with under 18 hours of readings or readings that failed our checks.
Jan 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Dec 2023No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Nov 2023No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Oct 2023No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 202310 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 20 with under 18 hours of readings or readings that failed our checks.
Jun 202312 of 30 days measured; a month needs 21. The others: 18 with under 18 hours of readings or readings that failed our checks.
May 202318 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks.
Mar 202311 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive.
Feb 2023No day measured. The others: 25 missing from OpenAQ's archive, 3 with under 18 hours of readings or readings that failed our checks.
Jan 202315 of 31 days measured; a month needs 22. The others: 6 missing from OpenAQ's archive, 8 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.

Naucalpan de Juárez's worst months

MonthUS AQIDays measuredWorld rank
May 2026 8929.6 µg/m³22 of 31178thof 2,874
February 2026 8125.1 µg/m³24 of 28372ndof 2,866
May 2025 8024.9 µg/m³27 of 31197thof 2,826
January 2026 7924.0 µg/m³26 of 31274thof 2,617
December 2025 7823.8 µg/m³31 of 31385thof 3,006
July 2026 7723.0 µg/m³31 of 31252ndof 2,784

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.

Naucalpan de Juárez's worst days

DayUS AQI
22 Jan 2025 12344.4 µg/m³
25 Dec 2024 11942.7 µg/m³
28 Feb 2025 11742.1 µg/m³
25 Dec 2025 11541.3 µg/m³
9 Mar 2026 11440.7 µg/m³
12 Dec 2024 11440.6 µg/m³
24 Jan 2025 11240.1 µg/m³
25 Jan 2025 11039.1 µg/m³
4 Jul 2026 10938.8 µg/m³
16 Feb 2026 10838.3 µg/m³

Daily means, the highest since 3 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, Naucalpan de Juárez, Mexico, 3 Jan 2023 – 11 Oct 2026. Monitor data from Sinaica Mexico via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/mx/naucalpan-de-juarez/history (accessed 13 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.

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

Updated 2026-10-13 01:07 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).