SmogRank / Rio Claro / Rio de Janeiro
Rio Claro vs Rio de Janeiro: PM2.5 compared
Over the last year, Rio Claro's air was about 2.0× as polluted as Rio de Janeiro's: PM2.5 averaged 14.2 µg/m³ against 7.1, on the 339 days both cities were measured. Rio Claro had the dirtier air on 306 of those days, Rio de Janeiro on 33. Rio Claro was over the WHO's daily guideline of 15 µg/m³ on 120 of them, Rio de Janeiro on 17.
Right now
The last year, day by day
Month by month
Year by year
| Year | Rio Claro | Rio de Janeiro | Days Rio Claro was worse |
|---|---|---|---|
| 2026 so far | 14.8 | 6.8 | 237 |
| 2025 | 16.0 | 8.6 | 269 |
| 2024 | 20.0 | 12.9 | 230 |
| 2023 | 16.1 | 9.1 | 92 |
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
Rio Claro
- 13 Aug 202611440.6 µg/m³
- 14 Aug 202610838.5 µg/m³
- 19 Aug 202610135.6 µg/m³
Rio de Janeiro
- 29 Oct 20257723.2 µg/m³
- 1 Jan 20267722.9 µg/m³
- 12 Jun 20267320.7 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
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).
Rio de Janeiro
Side by side with Acari (the nearest), Gujranwala (the world's worst on 30 days).
Use this page
SmogRank, PM2.5 daily means compared, Rio Claro and Rio de Janeiro, 13 Oct 2025 – 12 Oct 2026, smogrank.com/compare/br-rio-claro/br-rio-de-janeiro (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.