SmogRank / Mexico / Hidalgo / Tulancingo

Tulancingo, month by month

Tulancingo has a measured daily mean on 553 days since 28 March 2025. Its worst month was April 2025, at 75 US AQI (21.9 µg/m³), 283rd of 2,951 cities on that month's world ranking. Its cleanest was September 2025, at 52 US AQI (9.9 µg/m³).

Every month since 2025

202662 so far284 days measured564th of 2,791 in the world

Jan64#687 Feb65#701 Mar68#666 Apr62#575 May68#323 Jun57#462 Jul60#607 Aug61#417 Sep56#494 Oct43#1,059

202561 for the year269 days measured428th of 2,681 in the world

JanFebMar4 daysApr75#283 May74#237 Jun55#913 Jul59#603 Aug55#909 Sep52#708 Oct54#510 Nov61#605 Dec66#644

Each square is a month's mean PM2.5 in US AQI from Tulancingo'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 Tulancingo 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

1 month

Month	Why
Mar 2025	4 of 31 days measured; a month needs 22.

A day counts once 18 hours of it are measured; a month needs 70% of its days.

Tulancingo's worst months

Month	US AQI	Days measured	World rank
April 2025	7521.9 µg/m³	26 of 30	283rdof 2,951
May 2025	7421.4 µg/m³	31 of 31	237thof 2,826
May 2026	6818.3 µg/m³	31 of 31	323rdof 2,874
March 2026	6818.2 µg/m³	31 of 31	666thof 2,971
December 2025	6617.0 µg/m³	31 of 31	644thof 3,006
February 2026	6516.7 µg/m³	28 of 28	701stof 2,866

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.

Tulancingo's worst days

Day	US AQI
25 Apr 2025	10838.5 µg/m³
21 May 2025	10637.5 µg/m³
17 May 2025	10035.2 µg/m³
22 May 2025	10035.2 µg/m³
19 Apr 2025	9834.2 µg/m³
3 May 2025	9633.4 µg/m³
8 Mar 2026	9633.4 µg/m³
18 Apr 2025	9432.2 µg/m³
24 Apr 2025	9432.2 µg/m³
2 May 2025	9331.7 µg/m³

Daily means, the highest since 28 Mar 2025; 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, Tulancingo, Mexico, 28 Mar 2025 – 11 Oct 2026. Monitor data from Sinaica Mexico via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/mx/tulancingo/history (accessed 12 Oct 2026).

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Tulancingo 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).