SmogRank / Brazil / Rio de Janeiro / Nilópolis

Nilópolis, month by month

Nilópolis has a measured daily mean on 297 days since 5 December 2025. Its worst month was June 2026, at 87 US AQI (28.6 µg/m³), 163rd of 2,497 cities on that month's world ranking. Its cleanest was February 2026, at 55 US AQI (11.3 µg/m³).

Every month since 2025

202667 so far273 days measured421st of 2,791 in the world
Jan59#845Feb55#1,131Mar59#992Apr62#566May66#357Jun87#163Jul78#239Aug80#174Sep61#403Oct65#177
2025too few days for a mean (a year needs 256)24 days measured
JanFebMarAprMayJunJulAugSepOctNovDec58#890
Each square is a month's mean PM2.5 in US AQI from Nilópolis'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 Nilópolis 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

Nilópolis's worst months

MonthUS AQIDays measuredWorld rankEpisode
June 2026 8728.6 µg/m³28 of 30163rdof 2,497Rio de Janeiro and São Paulo, Brazil, June 2026
August 2026 8024.4 µg/m³31 of 31174thof 2,896–
July 2026 7823.8 µg/m³29 of 31239thof 2,784–
May 2026 6616.9 µg/m³31 of 31357thof 2,874São Paulo and Rio de Janeiro, Brazil, May 2026
April 2026 6215.2 µg/m³28 of 30566thof 2,941–
September 2026 6114.3 µg/m³30 of 30403rdof 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.

Nilópolis's worst days

DayUS AQIEpisode
11 Jun 2026 16373.2 µg/m³Rio de Janeiro and São Paulo, Brazil, June 2026
28 Jun 2026 15763.8 µg/m³–
17 Jul 2026 15662.7 µg/m³–
4 Aug 2026 15459.6 µg/m³–
12 Jun 2026 15257.1 µg/m³–
5 Aug 2026 15156.1 µg/m³–
11 Jul 2026 14352.6 µg/m³–
17 May 2026 14151.8 µg/m³–
30 Jun 2026 13850.4 µg/m³–
27 Jun 2026 13750.0 µg/m³–

Daily means, the highest since 5 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, Nilópolis, Brazil, 5 Dec 2025 – 11 Oct 2026. Monitor data from Rio City Hall via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/br/nilopolis/history (accessed 12 Oct 2026).

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Nilópolis 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).