SmogRank / United States / Colorado / Cañon City

Cañon City, month by month

Cañon City has a measured daily mean on 631 days since 7 January 2025. Its worst month was July 2026, at 53 US AQI (10.4 µg/m³), 1,259th of 2,784 cities on that month's world ranking. Its cleanest was December 2025, at 13 US AQI (2.3 µg/m³).

Every month since 2025

202627 so far275 days measured2,653rd of 2,798 in the world
Jan17#2,581Feb14#2,839Mar20#2,860Apr17#2,865May22#2,666Jun36#1,735Jul53#1,259Aug45#1,572Sep17#2,928Oct19#2,641
202524 for the year356 days measured2,604th of 2,681 in the world
Jan21#2,402Feb31#2,238Mar17#2,806Apr24#2,713May22#2,629Jun29#2,276Jul34#2,236Aug41#2,059Sep29#2,508Oct18#2,554Nov19#2,630Dec13#2,984
Each square is a month's mean PM2.5 in US AQI from Cañon City'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 Cañon City 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

Cañon City's worst months

MonthUS AQIDays measuredWorld rankEpisode
July 2026 5310.4 µg/m³29 of 311,259thof 2,784North-western United States and Canada, July and August 2026
August 2026 458.1 µg/m³31 of 311,572ndof 2,896North-western United States and Canada, July and August 2026
August 2025 417.3 µg/m³31 of 312,059thof 2,901–
June 2026 366.4 µg/m³30 of 301,735thof 2,497–
July 2025 346.2 µg/m³30 of 312,236thof 2,889–
February 2025 315.6 µg/m³28 of 282,238thof 2,633–

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.

Cañon City's worst days

DayUS AQIEpisode
30 Jun 2026 11039.2 µg/m³–
3 Jul 2026 10737.8 µg/m³–
4 Aug 2026 9633.3 µg/m³North-western United States and Canada, July and August 2026
5 Jul 2026 9432.0 µg/m³–
6 Jul 2026 8326.2 µg/m³–
5 Sept 2025 7722.9 µg/m³–
7 Jul 2026 7622.3 µg/m³–
14 Aug 2025 7119.7 µg/m³–
5 Aug 2026 7119.7 µg/m³–
2 Jul 2026 6918.8 µg/m³–

Daily means, the highest since 7 Jan 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, Cañon City, United States, 7 Jan 2025 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/canon-city/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.

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

Updated 2026-10-13 02:07 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).