SmogRank / Chile / Valparaiso / Quintero
Quintero, month by month
Quintero has a measured daily mean on 1,308 days since 1 January 2023. Its worst month was July 2024, at 113 US AQI (40.4 µg/m³), 44th of 2,566 cities on that month's world ranking. Its cleanest was January 2025, at 69 US AQI (18.5 µg/m³). 2025 averaged 78 US AQI (23.5 µg/m³), against 80 US AQI (24.6 µg/m³) in 2024.
Every month since 2023
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
Months without a mean, and why
2 months
| Month | Why |
|---|---|
| Mar 2023 | 11 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive. |
| Feb 2023 | 3 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Quintero's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2024 | 11340.4 µg/m³ | 44thof 2,566 | Chile, July 2024 |
| June 2025 | 9834.5 µg/m³ | 99thof 2,508 | – |
| July 2025 | 9733.6 µg/m³ | 68thof 2,889 | – |
| June 2026 | 9633.5 µg/m³ | 116thof 2,497 | – |
| May 2026 | 9432.1 µg/m³ | 158thof 2,874 | – |
| May 2023 | 9331.8 µg/m³ | 55thof 1,600 | – |
Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.
Quintero's worst days
| Day | US AQI | Episode |
|---|---|---|
| 14 Jul 2024 | 15764.4 µg/m³ | Chile, July 2024 |
| 20 May 2024 | 15358.0 µg/m³ | – |
| 12 Jul 2025 | 15256.3 µg/m³ | – |
| 13 Jul 2024 | 15155.9 µg/m³ | Chile, July 2024 |
| 16 Jul 2024 | 15155.9 µg/m³ | – |
| 15 Jul 2024 | 15155.8 µg/m³ | – |
| 16 Jun 2026 | 15055.3 µg/m³ | – |
| 15 May 2026 | 14954.9 µg/m³ | – |
| 19 May 2024 | 14553.4 µg/m³ | – |
| 9 Jun 2025 | 14252.2 µg/m³ | – |
Daily means, the highest since 1 Jan 2023; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.
Use this history
SmogRank, PM2.5 monthly and daily means, Quintero, Chile, 1 Jan 2023 – 11 Oct 2026. Monitor data from Chile - SINCA via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/cl/quintero/history (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.
Quintero now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 17:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).