SmogRank / United States / Pennsylvania / Chambersburg

Chambersburg, month by month

Chambersburg has a measured daily mean on 96 days since 2 July 2026. Its worst month was July 2026, at 72 US AQI (20.4 µg/m³), 317th of 2,784 cities on that month's world ranking. Its cleanest was September 2026, at 32 US AQI (5.7 µg/m³).

Every month since 2026

2026too few days for a mean (a year needs 199)96 days measured

JanFebMarAprMayJunJul72#317 Aug49#1,258 Sep32#1,947 Oct31#2,003

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

Chambersburg's worst months

Month	US AQI	Days measured	World rank	Episode
July 2026	7220.4 µg/m³	30 of 31	317thof 2,784	Northern United States and Canada, July 2026
August 2026	498.8 µg/m³	31 of 31	1,258thof 2,896	–
September 2026	325.7 µg/m³	26 of 30	1,947thof 2,981	–

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.

Chambersburg's worst days

Day	US AQI	Episode
17 Jul 2026	246171.0 µg/m³	Northern United States and Canada, July 2026
16 Jul 2026	16373.0 µg/m³	Northern United States and Canada, July 2026
18 Jul 2026	16271.7 µg/m³	Northern United States and Canada, July 2026
2 Jul 2026	8225.6 µg/m³	–
20 Jul 2026	7823.4 µg/m³	Northern United States and Canada, July 2026
19 Jul 2026	7522.0 µg/m³	Northern United States and Canada, July 2026
3 Jul 2026	6818.1 µg/m³	–
21 Jul 2026	6516.4 µg/m³	Northern United States and Canada, July 2026
14 Aug 2026	6415.9 µg/m³	–
11 Aug 2026	6315.3 µg/m³	–

Daily means, the highest since 2 Jul 2026; 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, Chambersburg, United States, 2 Jul 2026 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/chambersburg/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.

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

Updated 2026-10-12 23:07 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).