SmogRank / Brazil / Rio de Janeiro / Itaguaí

Itaguaí, month by month

Itaguaí has a measured daily mean on 172 days since 27 March 2026. Its worst month was June 2026, at 61 US AQI (14.3 µg/m³), 373rd of 2,497 cities on that month's world ranking. Its cleanest was September 2026, at 46 US AQI (8.3 µg/m³).

Every month since 2026

2026too few days for a mean (a year needs 199)172 days measured

JanFebMar5 daysApr54#800 May56#592 Jun61#373 Jul58#739Aug12 daysSep46#933 Oct51#712

Each square is a month's mean PM2.5 in US AQI from Itaguaí'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 Itaguaí 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

2 months

Month	Why
Aug 2026	12 of 31 days measured; a month needs 22. The others: 1 with readings for part of the day (a day needs 18 hours), 18 with readings left out by our checks.
Mar 2026	5 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.

Itaguaí's worst months

Month	US AQI	Days measured	World rank	Episode
June 2026	6114.3 µg/m³	28 of 30	373rdof 2,497	Rio de Janeiro and São Paulo, Brazil, June 2026
July 2026	5812.9 µg/m³	29 of 31	739thof 2,784	–
May 2026	5611.9 µg/m³	31 of 31	592ndof 2,874	São Paulo and Rio de Janeiro, Brazil, May 2026
April 2026	5410.9 µg/m³	28 of 30	800thof 2,941	–
September 2026	468.3 µg/m³	28 of 30	933rdof 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.

Itaguaí's worst days

Day	US AQI	Episode
17 May 2026	11742.0 µg/m³	–
11 Jul 2026	10537.3 µg/m³	–
11 Jun 2026	9633.5 µg/m³	Rio de Janeiro and São Paulo, Brazil, June 2026
16 May 2026	9532.8 µg/m³	São Paulo and Rio de Janeiro, Brazil, May 2026
8 Jun 2026	8828.8 µg/m³	–
30 Jun 2026	8326.4 µg/m³	–
28 Jul 2026	8326.3 µg/m³	–
1 Jul 2026	8125.4 µg/m³	–
7 Jun 2026	8024.9 µg/m³	–
7 May 2026	8024.6 µg/m³	–

Daily means, the highest since 27 Mar 2026; 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, Itaguaí, Brazil, 27 Mar 2026 – 11 Oct 2026. Monitor data from Rio City Hall via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/br/itaguai/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.

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

Updated 2026-10-12 22:07 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).