SmogRank / Italy / Lombardy / Mortara

Mortara, month by month

Mortara has a measured daily mean on 352 days since 29 January 2024. Its worst month was February 2024, at 114 US AQI (40.7 µg/m³), 57th of 2,486 cities on that month's world ranking. Its cleanest was May 2024, at 52 US AQI (9.5 µg/m³).

Every month since 2024

2026too few days for a mean (a year needs 199)87 days measured
Jan3 daysFebnoneMarnoneApr20 daysMay53#737Jun52#717Jul3 daysAug1 daySep4 daysOct5 days
2025too few days for a mean (a year needs 256)153 days measured
JannoneFebnoneMar2 daysApr54#1,009May19 daysJun14 daysJul57#768Aug60#437Sep52#733Oct8 daysNovnoneDecnone
2024too few days for a mean (a year needs 257)112 days measured
Jan3 daysFeb114#57Mar11 daysApr52#1,047May52#853Jun6 daysJul3 daysAug1 daySepnoneOctnoneNovnoneDecnone
Each square is a month's mean PM2.5 in US AQI from Mortara'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 Mortara 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

25 months
MonthWhy
Oct 20265 of 11 days measured; a month needs 8. The others: 1 with no readings from the monitor, 4 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 20264 of 30 days measured; a month needs 21. The others: 26 with under 18 hours of readings or readings that failed our checks.
Aug 20261 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks.
Jul 20263 of 31 days measured; a month needs 22. The others: 28 with under 18 hours of readings or readings that failed our checks.
Apr 202620 of 30 days measured; a month needs 21. The others: 10 with under 18 hours of readings or readings that failed our checks.
Mar 2026No day measured. The others: 31 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 20263 of 31 days measured; a month needs 22. The others: 28 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 20258 of 31 days measured; a month needs 22. The others: 23 with under 18 hours of readings or readings that failed our checks.
Jun 202514 of 30 days measured; a month needs 21. The others: 16 with under 18 hours of readings or readings that failed our checks.
May 202519 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks.
Mar 20252 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks.
Feb 2025No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks.
Jan 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Dec 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Nov 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Oct 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Sep 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 20241 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks.
Jul 20243 of 31 days measured; a month needs 22. The others: 28 with under 18 hours of readings or readings that failed our checks.
Jun 20246 of 30 days measured; a month needs 21. The others: 24 with under 18 hours of readings or readings that failed our checks.
Mar 202411 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks.
Jan 20243 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.

Mortara's worst months

MonthUS AQIDays measuredWorld rankEpisode
February 2024 11440.7 µg/m³28 of 2957thof 2,486Italy, Switzerland and France, February 2024
Southern Europe, February 2024
August 2025 6014.0 µg/m³31 of 31437thof 2,901Italy and Switzerland, August 2025
July 2025 5712.3 µg/m³22 of 31768thof 2,889–
April 2025 5410.7 µg/m³27 of 301,009thof 2,951–
May 2026 5310.2 µg/m³28 of 31737thof 2,874–
April 2024 529.8 µg/m³29 of 301,047thof 2,520–

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.

Mortara's worst days

DayUS AQIEpisode
18 Feb 2024 18096.7 µg/m³Italy, Switzerland and France, February 2024
19 Feb 2024 17995.0 µg/m³Italy, Switzerland and France, February 2024
6 Feb 2024 16981.6 µg/m³Southern Europe, February 2024
20 Feb 2024 16980.7 µg/m³Italy, Switzerland and France, February 2024
9 Feb 2024 16067.7 µg/m³Southern Europe, February 2024
17 Feb 2024 15764.7 µg/m³Italy, Switzerland and France, February 2024
16 Feb 2024 15662.6 µg/m³Italy, Switzerland and France, February 2024
7 Feb 2024 15561.6 µg/m³Southern Europe, February 2024
2 Feb 2024 15358.2 µg/m³–
21 Feb 2024 15055.4 µg/m³Italy, Switzerland and France, February 2024

Daily means, the highest since 29 Jan 2024; 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, Mortara, Italy, 29 Jan 2024 – 11 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/it/mortara/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.

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

Updated 2026-10-12 18:07 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).