SmogRank / United States / Virginia / Salem

Salem, month by month

Salem, Virginia has a measured daily mean on 292 days since 19 December 2025. Its worst month was July 2026, at 55 US AQI (11.0 µg/m³), 1,114th of 2,784 cities on that month's world ranking. Its cleanest was May 2026, at 29 US AQI (5.2 µg/m³).

Every month since 2025

202638 so far279 days measured2,254th of 2,791 in the world

Jan37#1,930 Feb38#2,253 Mar39#2,338 Apr35#2,114 May29#2,249 Jun35#1,780 Jul55#1,114 Aug41#1,948 Sep34#1,709 Oct26#2,257

2025too few days for a mean (a year needs 256)13 days measured

JanFebMarAprMayJunJulAugSepOctNovDec13 days

Each square is a month's mean PM2.5 in US AQI from Salem'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 Salem 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
Dec 2025	13 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.

Salem's worst months

Month	US AQI	Days measured	World rank	Episode
July 2026	5511.0 µg/m³	31 of 31	1,114thof 2,784	Northern United States and Canada, July 2026
August 2026	417.3 µg/m³	31 of 31	1,948thof 2,896	–
March 2026	397.1 µg/m³	31 of 31	2,338thof 2,971	–
February 2026	386.9 µg/m³	28 of 28	2,253rdof 2,866	–
January 2026	376.6 µg/m³	31 of 31	1,930thof 2,617	–
April 2026	356.3 µg/m³	30 of 30	2,114thof 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.

Salem's worst days

Day	US AQI	Episode
17 Jul 2026	12545.1 µg/m³	Northern United States and Canada, July 2026
18 Jul 2026	7823.6 µg/m³	Northern United States and Canada, July 2026
4 Feb 2026	7019.1 µg/m³	–
3 Jul 2026	6818.4 µg/m³	–
20 Jul 2026	6717.8 µg/m³	Northern United States and Canada, July 2026
9 Jan 2026	6717.6 µg/m³	–
2 Jul 2026	6616.9 µg/m³	–
10 Feb 2026	6416.3 µg/m³	–
4 Jul 2026	6416.1 µg/m³	–
26 Mar 2026	6315.4 µg/m³	–

Daily means, the highest since 19 Dec 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, Salem, Virginia, United States, 19 Dec 2025 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/salem-virginia/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.

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

Updated 2026-10-12 19:07 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).