SmogRank / Mexico / Nuevo León / Santa Catarina

Santa Catarina, month by month

Santa Catarina has a measured daily mean on 793 days since 10 January 2023. Its worst month was December 2023, at 89 US AQI (29.3 µg/m³), 68th of 2,247 cities on that month's world ranking. Its cleanest was September 2026, at 57 US AQI (12.5 µg/m³).

Every month since 2023

202666 so far263 days measured460th of 2,793 in the world
Jan21 daysFeb68#625Mar67#681Apr71#408May63#395Jun62#341Jul72#322Aug69#275Sep57#470Oct35#1,641
202573 for the year261 days measured236th of 2,681 in the world
Jan9 daysFeb3 daysMar16 daysApr67#455May19 daysJun63#411Jul67#261Aug19 daysSep71#222Oct71#286Nov80#302Dec75#433
2024too few days for a mean (a year needs 257)58 days measured
Jan15 daysFeb4 daysMar4 daysApr11 daysMay3 daysJun2 daysJul2 daysAug2 daysSepnoneOct4 daysNov6 daysDec5 days
2023too few days for a mean (a year needs 256)211 days measured
Jan15 daysFeb2 daysMar11 daysApr70#121May6 daysJun2 daysJul19 daysAug69#143Sep66#131Oct17 daysNov78#55Dec89#68
Each square is a month's mean PM2.5 in US AQI from Santa Catarina'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 Santa Catarina 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

25 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.
Aug 202519 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks.
May 202519 of 31 days measured; a month needs 22. The others: 12 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 20253 of 28 days measured; a month needs 20. The others: 25 with under 18 hours of readings or readings that failed our checks.
Jan 20259 of 31 days measured; a month needs 22. The others: 22 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 20246 of 30 days measured; a month needs 21. The others: 24 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 20242 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks.
Jul 20242 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks.
Jun 20242 of 30 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks.
May 20243 of 31 days measured; a month needs 22. The others: 28 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 20244 of 29 days measured; a month needs 21. The others: 25 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 202319 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 11 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 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 202315 of 31 days measured; a month needs 22. The others: 6 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.

Santa Catarina's worst months

MonthUS AQIDays measuredWorld rank
December 2023 8929.3 µg/m³31 of 3168thof 2,247
November 2025 8024.7 µg/m³28 of 30302ndof 2,715
November 2023 7823.6 µg/m³30 of 3055thof 2,243
December 2025 7522.2 µg/m³31 of 31433rdof 3,006
July 2026 7220.3 µg/m³31 of 31322ndof 2,784
April 2026 7120.0 µg/m³25 of 30408thof 2,941

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.

Santa Catarina's worst days

DayUS AQIEpisode
25 Sept 2025 18097.1 µg/m³–
28 Jan 2023 16169.9 µg/m³Northern Mexico and United States, January 2023
30 Jan 2025 15966.2 µg/m³–
22 Dec 2023 14854.4 µg/m³–
19 Mar 2025 14653.8 µg/m³–
30 Nov 2023 14653.6 µg/m³–
21 Dec 2023 14453.0 µg/m³–
3 Dec 2025 14452.8 µg/m³–
1 Dec 2023 13850.7 µg/m³–
2 Dec 2023 13750.3 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, Santa Catarina, Mexico, 10 Jan 2023 – 11 Oct 2026. Monitor data from Sinaica Mexico via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/mx/santa-catarina/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.

Santa Catarina 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).