SmogRank / Italy / Campania / Naples

Naples, month by month

Naples has a measured daily mean on 748 days since 11 January 2023. Its worst month was December 2023, at 74 US AQI (21.2 µg/m³), 143rd of 2,247 cities on that month's world ranking. Its cleanest was September 2025, at 41 US AQI (7.4 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 199)172 days measured
Jan3 daysFebnoneMar2 daysApr57#715May52#819Jun55#520Jul57#884Aug61#417Sep51#773Oct57#390
2025too few days for a mean (a year needs 256)128 days measured
JannoneFebnoneMar2 daysApr51#1,410May15 daysJun11 daysJul18 daysAug60#437Sep41#1,524Oct4 daysNovnoneDecnone
2024too few days for a mean (a year needs 257)143 days measured
Jan69#314Feb71#206Mar13 daysApr59#525May56#501Jun12 daysJulnoneAugnoneSepnoneOctnoneNovnoneDecnone
202363 for the year305 days measured112th of 1,355 in the world
Jan8 daysFeb69#171Mar59#118Apr58#220May54#400Jun62#379Jul19 daysAug64#176Sep69#119Oct64#103Nov54#444Dec74#143
Each square is a month's mean PM2.5 in US AQI from Naples'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 Naples 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

22 months
MonthWhy
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 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 20254 of 31 days measured; a month needs 22. The others: 27 with under 18 hours of readings or readings that failed our checks.
Jul 202518 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks.
Jun 202511 of 30 days measured; a month needs 21. The others: 19 with under 18 hours of readings or readings that failed our checks.
May 202515 of 31 days measured; a month needs 22. The others: 16 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 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jun 202412 of 30 days measured; a month needs 21. The others: 18 with under 18 hours of readings or readings that failed our checks.
Mar 202413 of 31 days measured; a month needs 22. The others: 18 with under 18 hours of readings or readings that failed our checks.
Jul 202319 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks.
Jan 20238 of 31 days measured; a month needs 22. The others: 13 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.

Naples's worst months

MonthUS AQIDays measuredWorld rankEpisode
December 2023 7421.2 µg/m³28 of 31143rdof 2,247South-eastern Europe, 28 December 2023 to 1 January 2024
Eastern Europe, December 2023and 1 more
February 2024 7119.8 µg/m³29 of 29206thof 2,486Europe, 27 January to 2 February 2024
February 2023 6918.5 µg/m³25 of 28171stof 1,129Europe, 6 to 25 February 2023
September 2023 6918.5 µg/m³30 of 30119thof 2,176–
January 2024 6918.5 µg/m³29 of 31314thof 2,385Europe, 27 January to 2 February 2024
Europe, 8 to 27 January 2024and 1 more
October 2023 6416.2 µg/m³30 of 31103rdof 2,012–

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.

Naples's worst days

DayUS AQIEpisode
31 Mar 2024 13248.0 µg/m³–
20 Dec 2023 12946.8 µg/m³Eastern Europe, December 2023
27 Jan 2024 12344.3 µg/m³Europe, 27 January to 2 February 2024
Europe, 8 to 27 January 2024
1 Apr 2024 12244.1 µg/m³–
21 Dec 2023 11742.0 µg/m³Eastern Europe, December 2023
Italy, Bosnia and Herzegovina and 2 more countries, December 2023
17 Feb 2024 11440.6 µg/m³–
19 Dec 2023 11239.8 µg/m³Eastern Europe, December 2023
31 Jan 2024 11239.8 µg/m³Europe, 27 January to 2 February 2024
18 Feb 2024 10938.9 µg/m³–
26 Jan 2024 10336.2 µg/m³Europe, 8 to 27 January 2024

Daily means, the highest since 11 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, Naples, Italy, 11 Jan 2023 – 11 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/it/naples/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.

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

Updated 2026-10-12 17:07 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).