SmogRank / Chile / Santiago Metropolitan / Puente Alto
Puente Alto, month by month
Puente Alto has a measured daily mean on 1,225 days since 1 January 2023. Its worst month was July 2024, at 143 US AQI (52.7 µg/m³), 27th of 2,566 cities on that month's world ranking. Its cleanest was February 2026, at 74 US AQI (21.4 µg/m³). 2025 averaged 94 US AQI (32.0 µg/m³), against 89 US AQI (29.4 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
3 months
| Month | Why |
|---|---|
| Nov 2023 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| 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.
Puente Alto's worst months
| Month | US AQI | World rank |
|---|---|---|
| July 2024 | 14352.7 µg/m³ | 27thof 2,566 |
| July 2025 | 14352.7 µg/m³ | 29thof 2,889 |
| May 2026 | 13047.3 µg/m³ | 70thof 2,874 |
| June 2026 | 12946.7 µg/m³ | 59thof 2,497 |
| June 2025 | 12545.4 µg/m³ | 57thof 2,508 |
| May 2025 | 12344.3 µg/m³ | 50thof 2,826 |
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.
Puente Alto's worst days
| Day | US AQI |
|---|---|
| 15 Jul 2025 | 17285.9 µg/m³ |
| 23 May 2026 | 16981.7 µg/m³ |
| 13 Jul 2025 | 16981.6 µg/m³ |
| 24 May 2026 | 16777.9 µg/m³ |
| 14 May 2026 | 16777.7 µg/m³ |
| 14 Jul 2024 | 16373.1 µg/m³ |
| 14 Jul 2025 | 16373.0 µg/m³ |
| 2 Jun 2026 | 16372.7 µg/m³ |
| 7 May 2025 | 16372.5 µg/m³ |
| 22 May 2026 | 16271.6 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, Puente Alto, Chile, 1 Jan 2023 – 9 Oct 2026. Monitor data from Chile - SINCA via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/cl/puente-alto/history (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.
Puente Alto now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 03:07 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).