SmogRank / Mexico / Nuevo León / Ciudad Apodaca

Ciudad Apodaca, month by month

Ciudad Apodaca has a measured daily mean on 513 days since 10 January 2023. Its worst month was December 2023, at 85 US AQI (27.2 µg/m³), 78th of 2,247 cities on that month's world ranking. Its cleanest was June 2026, at 58 US AQI (12.7 µg/m³).

Every month since 2023

202663 so far271 days measured532nd of 2,791 in the world
Jan66#626Feb67#646Mar61#902Apr66#489May62#426Jun58#434Jul65#430Aug64#357Sep59#427Oct57#390
2025too few days for a mean (a year needs 256)14 days measured
JannoneFebnoneMarnoneAprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOctnoneNovnoneDec14 days
2024too few days for a mean (a year needs 257)46 days measured
Jan15 daysFeb5 daysMar4 daysApr11 daysMay4 daysJunnoneJul6 daysAug1 daySepnoneOctnoneNovnoneDecnone
2023too few days for a mean (a year needs 256)182 days measured
Jan14 daysFeb2 daysMar11 daysApr71#115May4 daysJun2 daysJul16 daysAug19 daysSep69#116Oct14 daysNov74#66Dec85#78
Each square is a month's mean PM2.5 in US AQI from Ciudad Apodaca'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 Ciudad Apodaca 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

32 months
MonthWhy
Dec 202514 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks.
Nov 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Oct 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Sep 2025No day measured. The others: 30 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 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 20241 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks.
Jul 20246 of 31 days measured; a month needs 22. The others: 25 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 20244 of 31 days measured; a month needs 22. The others: 27 with under 18 hours of readings or readings that failed our checks.
Apr 202411 of 30 days measured; a month needs 21. The others: 19 with under 18 hours of readings or readings that failed our checks.
Mar 20244 of 31 days measured; a month needs 22. The others: 27 with under 18 hours of readings or readings that failed our checks.
Feb 20245 of 29 days measured; a month needs 21. The others: 24 with under 18 hours of readings or readings that failed our checks.
Jan 202415 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks.
Oct 202314 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks.
Aug 202319 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks.
Jul 202316 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 14 with under 18 hours of readings or readings that failed our checks.
Jun 20232 of 30 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks.
May 20234 of 31 days measured; a month needs 22. The others: 27 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 20232 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive, 1 with under 18 hours of readings or readings that failed our checks.
Jan 202314 of 31 days measured; a month needs 22. The others: 6 missing from OpenAQ's archive, 2 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.

Ciudad Apodaca's worst months

MonthUS AQIDays measuredWorld rankEpisode
December 2023 8527.2 µg/m³29 of 3178thof 2,247–
November 2023 7421.2 µg/m³24 of 3066thof 2,243–
April 2023 7119.7 µg/m³22 of 30115thof 1,622–
September 2023 6918.8 µg/m³25 of 30116thof 2,176–
February 2026 6717.9 µg/m³28 of 28646thof 2,866Southern United States and Mexico, February 2026
January 2026 6617.1 µg/m³30 of 31626thof 2,617–

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.

Ciudad Apodaca's worst days

DayUS AQIEpisode
1 Jan 2024 17792.1 µg/m³–
31 Dec 2023 15459.8 µg/m³–
6 May 2023 13850.4 µg/m³Northern Mexico and United States, May 2023
29 Jan 2023 13750.0 µg/m³Northern Mexico and United States, January 2023
12 Jan 2024 13449.1 µg/m³–
28 Jan 2023 13348.6 µg/m³Northern Mexico and United States, January 2023
31 Mar 2023 13147.7 µg/m³–
10 Jan 2024 12846.6 µg/m³–
9 Dec 2023 11842.5 µg/m³–
1 Apr 2024 11742.0 µg/m³Southern United States and Mexico, April 2024

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, Ciudad Apodaca, Mexico, 10 Jan 2023 – 10 Oct 2026. Monitor data from Sinaica Mexico via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/mx/ciudad-apodaca/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.

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

Updated 2026-10-12 18:07 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).