SmogRank / Italy / Piedmont / Omegna

Omegna, month by month

Omegna has a measured daily mean on 184 days since 23 August 2025. Its worst month was August 2026, at 60 US AQI (13.8 µg/m³), 444th of 2,896 cities on that month's world ranking. Its cleanest was May 2026, at 41 US AQI (7.3 µg/m³).

Every month since 2025

2026too few days for a mean (a year needs 200)147 days measured
Jan4 daysFebnoneMar2 daysApr50#1,208May41#1,539Jun13 daysJul55#1,089Aug60#444Sep14 daysOct8 days
2025too few days for a mean (a year needs 256)37 days measured
JanFebMarAprMayJunJulAug4 daysSep44#1,244Oct5 daysNovnoneDecnone
Each square is a month's mean PM2.5 in US AQI from Omegna'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 Omegna marked; each year, the year's.
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

10 months
MonthWhy
Oct 20268 of 12 days measured; a month needs 9. The others: 1 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours), 1 with under 18 hours of readings or readings that failed our checks.
Sep 202614 of 30 days measured; a month needs 21. The others: 16 with under 18 hours of readings or readings that failed our checks.
Jun 202613 of 30 days measured; a month needs 21. The others: 17 with under 18 hours of readings or readings that failed our checks.
Mar 20262 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks.
Feb 2026No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks.
Jan 20264 of 31 days measured; a month needs 22. The others: 27 with under 18 hours of readings or readings that failed our checks.
Dec 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Nov 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Oct 20255 of 31 days measured; a month needs 22. The others: 26 with under 18 hours of readings or readings that failed our checks.
Aug 20254 of 31 days measured; a month needs 22. The others: 5 with under 18 hours of readings or readings that failed our checks.

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

Omegna's worst months

MonthUS AQIDays measuredWorld rank
August 2026 6013.8 µg/m³26 of 31444thof 2,896
July 2026 5511.1 µg/m³28 of 311,089thof 2,784
April 2026 509.0 µg/m³26 of 301,208thof 2,941
September 2025 448.0 µg/m³28 of 301,244thof 3,104
May 2026 417.3 µg/m³26 of 311,539thof 2,874

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.

Omegna's worst days

DayUS AQI
12 Aug 2026 11239.8 µg/m³
13 Aug 2026 9130.4 µg/m³
14 Aug 2026 8728.2 µg/m³
23 Jan 2026 8326.2 µg/m³
22 Jan 2026 7924.1 µg/m³
7 Oct 2026 7421.7 µg/m³
6 Oct 2026 7421.5 µg/m³
10 Aug 2026 7321.0 µg/m³
21 Jan 2026 7220.6 µg/m³
9 Aug 2026 7019.2 µg/m³

Daily means, the highest since 23 Aug 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, Omegna, Italy, 23 Aug 2025 – 12 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/it/omegna/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.

Omegna 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).