SmogRank / Rio Claro / São José do Rio Preto

Rio Claro vs São José do Rio Preto: PM2.5 compared

Over the last year, Rio Claro's air was 30% more polluted than São José do Rio Preto's: PM2.5 averaged 14.3 µg/m³ against 11.0, on the 312 days both cities were measured. Rio Claro had the dirtier air on 235 of those days, São José do Rio Preto on 73. Rio Claro was over the WHO's daily guideline of 15 µg/m³ on 112 of them, São José do Rio Preto on 71.

Right now

Rio Claro#391on the 24-hour board of 2,408, at 58 US AQI (13.0 µg/m³)
São José do Rio Preto#620on the 24-hour board of 2,408, at 53 US AQI (10.1 µg/m³)

The last year, day by day

Rio Claro
São José do Rio Preto
Each city's daily mean from 12 Oct 2025 to 11 Oct 2026, one stripe a day, coloured by band. A blank stripe is a day without a daily mean.

Month by month

Rio Claro, Nov 2025: 12.8 µg/m³São José do Rio Preto, Nov 2025: 11.8 µg/m³Nov2025Rio Claro, Dec 2025: 10.3 µg/m³São José do Rio Preto, Dec 2025: 7.7 µg/m³DecRio Claro, Jan 2026: 9.1 µg/m³São José do Rio Preto, Jan 2026: 6.1 µg/m³Jan2026Rio Claro, Feb 2026: 9.2 µg/m³São José do Rio Preto, Feb 2026: 6.9 µg/m³FebRio Claro, Mar 2026: 13.8 µg/m³São José do Rio Preto, Mar 2026: 8.4 µg/m³MarRio Claro, Apr 2026: 17.8 µg/m³São José do Rio Preto, Apr 2026: 12.7 µg/m³AprRio Claro, May 2026: 13.1 µg/m³São José do Rio Preto, May 2026: 14.3 µg/m³MayRio Claro, Jun 2026: 16.0 µg/m³São José do Rio Preto, Jun 2026: 11.6 µg/m³JunRio Claro, Jul 2026: 17.7 µg/m³São José do Rio Preto, Jul 2026: 13.5 µg/m³JulRio Claro, Aug 2026: 21.9 µg/m³São José do Rio Preto, Aug 2026: 18.2 µg/m³AugRio Claro, Sep 2026: 14.1 µg/m³São José do Rio Preto, Sep 2026: 12.6 µg/m³SepRio Claro, Oct 2026: 15.4 µg/m³São José do Rio Preto, Oct 2026: 10.0 µg/m³Oct
Monthly means in µg/m³ over the days both cities were measured. Solid: Rio Claro. Faded: São José do Rio Preto. A month shows once both share 10 such days. Dashed line: the WHO daily guideline, 15 µg/m³.

Year by year

YearRio ClaroSão José do Rio PretoDays both measuredDays Rio Claro was worse
2026 so far6255258198
20256559324254
20247168295213
202354474338

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

Rio Claro

São José do Rio Preto

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).

São José do Rio Preto

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

Use this page

SmogRank, PM2.5 daily means compared, Rio Claro and São José do Rio Preto, 12 Oct 2025 – 11 Oct 2026, smogrank.com/compare/br-rio-claro/br-sao-jose-do-rio-preto (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 20:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.