Duque de Caxias vs Rio Claro: PM2.5 compared

Over the last year, Rio Claro's air was 29% more polluted than Duque de Caxias's: PM2.5 averaged 14.4 µg/m³ against 11.2, on the 288 days both cities were measured. Rio Claro had the dirtier air on 199 of those days, Duque de Caxias on 88. Rio Claro was over the WHO's daily guideline of 15 µg/m³ on 105 of them, Duque de Caxias on 59.

Right now

Duque de Caxias#845on the 24-hour board of 2,581, at 49 US AQI (8.9 µg/m³)

Rio Claro#381on the 24-hour board of 2,581, at 60 US AQI (13.8 µg/m³)

The last year, day by day

Duque de Caxias

Rio Claro

Each city's daily mean from 13 Oct 2025 to 12 Oct 2026, one stripe a day, coloured by band. A blank stripe is a day without a daily mean.

Month by month

Monthly means in µg/m³ over the days both cities were measured. Solid: Duque de Caxias. Faded: Rio Claro. A month shows once both share 10 such days. Dashed line: the WHO daily guideline, 15 µg/m³.

Year by year

Year	Duque de Caxias	Rio Claro	Days both measured	Days Duque de Caxias was worse
2026 so far	11.5	14.8	259	77
2025	8.9	15.9	246	42
2024	10.4	15.1	96	21
2023	9.3	16.2	106	21

Means in µg/m³, as in the chart above, over the days both cities were measured that year; a year shows once they share 30 such days.

Each city's worst days

Duque de Caxias

11 Jun 202611139.4 µg/m³
3 Jul 202610637.5 µg/m³
9 Jun 202610537.3 µg/m³

Rio Claro

13 Aug 202611440.6 µg/m³
14 Aug 202610838.5 µg/m³
19 Aug 202610135.6 µg/m³

Daily means in US AQI, with µg/m³ beside them, since the index stops at its top value, over the days both cities were measured in the last year. Each date opens that day's world board.

Compare either city with another

Duque de Caxias

Side by side with Acari (the nearest), Gujranwala (the world's worst on 30 days).

Rio Claro

Side by side with Limeira (the nearest), Nilópolis (Brazil's 2nd worst on 30 days), Gujranwala (the world's worst on 30 days).

Use this page

SmogRank, PM2.5 daily means compared, Duque de Caxias and Rio Claro, 13 Oct 2025 – 12 Oct 2026, smogrank.com/compare/br-duque-de-caxias/br-rio-claro (accessed 13 Oct 2026).

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.

The same rules as every SmogRank figure: reference monitors first, and a day counts with 18 measured hours. How we measure.

Updated 2026-10-13 04:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.