SmogRank / United States / Maryland / Frostburg

Frostburg, month by month

Frostburg has a measured daily mean on 1,249 days since 1 January 2023. Its worst month was July 2026, at 63 US AQI (15.7 µg/m³), 480th of 2,784 cities on that month's world ranking. Its cleanest was October 2023, at 18 US AQI (3.2 µg/m³). 2025 averaged 33 US AQI (5.9 µg/m³), against 28 US AQI (5.1 µg/m³) in 2024.

Every month since 2023

202633 so far271 days measured2,490th of 2,798 in the world

Jan22#2,507 Feb29#2,575 Mar28#2,679 Apr28#2,472 May21#2,692 Jun26#2,218 Jul63#480 Aug36#2,290 Sep22#2,752 Oct22#2,517

202533 for the year347 days measured2,380th of 2,681 in the world

Jan32#2,066 Feb29#2,308 Mar32#2,351 Apr30#2,443 May24#2,515 Jun49#1,627 Jul43#1,824 Aug43#1,911 Sep33#2,136 Oct21#2,448 Nov28#2,409 Dec26#2,755

202428 for the year347 days measured1,938th of 2,097 in the world

Jan18#2,326 Feb31#1,989 Mar23#1,449 Apr24#2,169 May21#2,478 Jun39#1,661 Jul40#1,644 Aug37#1,634 Sep24#1,891 Oct26#1,854 Nov25#2,396 Dec30#2,213

202336 for the year284 days measured1,137th of 1,355 in the world

Jan21 daysFeb2 daysMar11 daysApr29#1,315May16 daysJun62#382 Jul42#918 Aug39#1,289 Sep24#2,068 Oct18#1,973 Nov30#1,886 Dec25#2,085

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

4 months

Month	Why
May 2023	16 of 31 days measured; a month needs 22. The others: 8 with no readings from the monitor, 7 with readings for part of the day (a day needs 18 hours).
Mar 2023	11 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive.
Feb 2023	2 of 28 days measured; a month needs 20. The others: 1 with no readings from the monitor, 25 missing from OpenAQ's archive.
Jan 2023	21 of 31 days measured; a month needs 22. The others: 3 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours), 6 missing from OpenAQ's archive.

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

Frostburg's worst months

Month	US AQI	Days measured	World rank	Episode
July 2026	6315.7 µg/m³	31 of 31	480thof 2,784	Northern United States and Canada, July 2026 North-eastern United States, June and July 2026
June 2023	6215.0 µg/m³	30 of 30	382ndof 1,603	Eastern United States and Canada, June and July 2023 Eastern United States and Canada, May and June 2023
June 2025	498.9 µg/m³	25 of 30	1,627thof 2,508	–
July 2025	437.8 µg/m³	31 of 31	1,824thof 2,889	–
August 2025	437.7 µg/m³	31 of 31	1,911thof 2,901	–
July 2023	427.5 µg/m³	30 of 31	918thof 1,432	United States and Canada, July 2023 Eastern United States and Canada, June and July 2023

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.

Frostburg's worst days

Day	US AQI	Episode
17 Jul 2026	224149.0 µg/m³	Northern United States and Canada, July 2026
29 Jun 2023	16980.7 µg/m³	Eastern United States and Canada, June and July 2023
28 Jun 2023	15459.6 µg/m³	Eastern United States and Canada, June and July 2023
18 Jul 2026	11039.2 µg/m³	Northern United States and Canada, July 2026
16 Jul 2026	10537.2 µg/m³	Northern United States and Canada, July 2026
30 Jun 2023	9633.4 µg/m³	Eastern United States and Canada, June and July 2023
17 Jul 2023	9030.2 µg/m³	United States and Canada, July 2023
2 Jul 2026	8527.2 µg/m³	North-eastern United States, June and July 2026
6 Jun 2023	8225.5 µg/m³	Eastern United States and Canada, May and June 2023
7 Jun 2023	8125.0 µg/m³	Eastern United States and Canada, May and June 2023

Daily means, the highest since 1 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, Frostburg, United States, 1 Jan 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/frostburg/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.

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

Updated 2026-10-13 00:07 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).