SmogRank / Mexico / Nuevo León / Ciudad Benito Juárez

Ciudad Benito Juárez, month by month

Ciudad Benito Juárez has a measured daily mean on 828 days since 16 January 2023. Its worst month was December 2023, at 128 US AQI (46.6 µg/m³), 30th of 2,247 cities on that month's world ranking. Its cleanest was June 2026, at 54 US AQI (10.9 µg/m³).

Every month since 2023

202665 so far254 days measured485th of 2,793 in the world
Jan21 daysFeb76#463Mar62#843Apr67#477May60#468Jun54#569Jul62#531Aug59#451Sep55#543Oct47#886
202574 for the year292 days measured219th of 2,681 in the world
Jan8 daysFeb5 daysMar16 daysApr72#329May82#186Jun61#477Jul71#214Aug62#373Sep58#403Oct71#290Nov85#273Dec97#271
2024too few days for a mean (a year needs 257)76 days measured
Jan15 daysFeb6 daysMar4 daysApr12 daysMay4 daysJun4 daysJul9 daysAug4 daysSep1 dayOct4 daysNov8 daysDec5 days
2023too few days for a mean (a year needs 256)206 days measured
Jan14 daysFeb2 daysMar11 daysApr94#37May6 daysJun4 daysJul15 daysAug68#152Sep61#201Oct17 daysNov84#37Dec128#30
Each square is a month's mean PM2.5 in US AQI from Ciudad Benito 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 Ciudad Benito 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

23 months
MonthWhy
Jan 202621 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Mar 202516 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks.
Feb 20255 of 28 days measured; a month needs 20. The others: 23 with under 18 hours of readings or readings that failed our checks.
Jan 20258 of 31 days measured; a month needs 22. The others: 23 with under 18 hours of readings or readings that failed our checks.
Dec 20245 of 31 days measured; a month needs 22. The others: 26 with under 18 hours of readings or readings that failed our checks.
Nov 20248 of 30 days measured; a month needs 21. The others: 22 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 20241 of 30 days measured; a month needs 21. The others: 29 with under 18 hours of readings or readings that failed our checks.
Aug 20244 of 31 days measured; a month needs 22. The others: 27 with under 18 hours of readings or readings that failed our checks.
Jul 20249 of 31 days measured; a month needs 22. The others: 22 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 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 202412 of 30 days measured; a month needs 21. The others: 18 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 20246 of 29 days measured; a month needs 21. The others: 23 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 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 202315 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 15 with under 18 hours of readings or readings that failed our checks.
Jun 20234 of 30 days measured; a month needs 21. The others: 26 with under 18 hours of readings or readings that failed our checks.
May 20236 of 31 days measured; a month needs 22. The others: 25 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: 1 missing from OpenAQ's archive, 1 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 Benito Juárez's worst months

MonthUS AQIDays measuredWorld rankEpisode
December 2023 12846.6 µg/m³31 of 3130thof 2,247–
December 2025 9733.9 µg/m³31 of 31271stof 3,006–
April 2023 9432.2 µg/m³24 of 3037thof 1,622–
November 2025 8527.2 µg/m³28 of 30273rdof 2,715–
November 2023 8427.0 µg/m³30 of 3037thof 2,243–
May 2025 8226.0 µg/m³29 of 31186thof 2,826Southern United States and Mexico, May 2025

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 Benito Juárez's worst days

DayUS AQIEpisode
31 Dec 2023 198122.0 µg/m³–
1 Jan 2026 196119.0 µg/m³–
17 Dec 2023 186106.0 µg/m³–
28 Jan 2023 17996.0 µg/m³Northern Mexico and United States, January 2023
31 Dec 2025 17487.7 µg/m³–
6 Jan 2024 17386.8 µg/m³–
1 Jan 2024 17285.8 µg/m³–
31 Mar 2023 17082.3 µg/m³–
29 Jan 2023 16879.3 µg/m³Northern Mexico and United States, January 2023
12 Jan 2024 16677.5 µg/m³–

Daily means, the highest since 16 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 Benito Juárez, Mexico, 16 Jan 2023 – 11 Oct 2026. Monitor data from Sinaica Mexico via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/mx/ciudad-benito-juarez/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 Benito Juárez now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-12 21:07 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).