Acari vs Rio Claro: PM2.5 compared
Over the last year, Rio Claro's air was about 1.8× as polluted as Acari's: PM2.5 averaged 14.5 µg/m³ against 7.9, on the 283 days both cities were measured. Rio Claro had the dirtier air on 248 of those days, Acari on 35. Rio Claro was over the WHO's daily guideline of 15 µg/m³ on 106 of them, Acari on 20.
Right now
The last year, day by day
Month by month
Year by year
| Year | Acari | Rio Claro | Days Acari was worse |
|---|---|---|---|
| 2026 so far | 43 | 62 | 29 |
| 2025 | 52 | 68 | 7 |
Means in US AQI over the days both cities were measured that year; a year shows once they share 30 such days.
Each city's worst days
Acari
- 4 Aug 20267823.8 µg/m³
- 1 Jan 20267823.6 µg/m³
- 11 Jun 20267723.1 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
Acari
Side by side with Duque de Caxias (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, Acari and Rio Claro, 12 Oct 2025 – 11 Oct 2026, smogrank.com/compare/br-acari/br-rio-claro (accessed 12 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 2026-10-12 22:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.