Guaratinguetá vs Rio Claro: PM2.5 compared

Over the last year, Rio Claro's air was about 1.6× as polluted as Guaratinguetá's: PM2.5 averaged 15.1 µg/m³ against 9.3, on the 261 days both cities were measured. Rio Claro had the dirtier air on 231 of those days, Guaratinguetá on 27. Rio Claro was over the WHO's daily guideline of 15 µg/m³ on 103 of them, Guaratinguetá on 14.

Right now

Guaratinguetá#174on the 24-hour board of 2,658, at 72 US AQI (20.3 µg/m³)

Rio Claro#783on the 24-hour board of 2,658, at 52 US AQI (9.7 µg/m³)

The last year, day by day

Guaratinguetá

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: Guaratinguetá. 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	Guaratinguetá	Rio Claro	Days both measured	Days Guaratinguetá was worse
2026 so far	8.8	15.2	225	14
2025	10.5	16.2	281	30
2024	13.4	20.9	301	45
2023	12.0	17.2	229	29

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

Guaratinguetá

14 Nov 20258527.6 µg/m³
13 Nov 20257622.3 µg/m³
17 Nov 20257522.1 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

Guaratinguetá

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

Rio Claro

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

Use this page

SmogRank, PM2.5 daily means compared, Guaratinguetá and Rio Claro, 13 Oct 2025 – 12 Oct 2026, smogrank.com/compare/br-guaratingueta/br-rio-claro (accessed 14 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 2026-10-14 00:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.