SmogRank / Chile / Antofagasta / Tocopilla
Tocopilla, month by month
Tocopilla has a measured daily mean on 1,287 days since 2 January 2023. Its worst month was April 2026, at 93 US AQI (31.8 µg/m³), 209th of 2,941 cities on that month's world ranking. Its cleanest was August 2026, at 67 US AQI (17.8 µg/m³). 2025 averaged 78 US AQI (23.8 µg/m³), against 77 US AQI (23.1 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 | 10 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive, 1 with under 18 hours of readings or readings that failed our checks. |
| 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.
Tocopilla's worst months
| Month | US AQI | World rank |
|---|---|---|
| April 2026 | 9331.8 µg/m³ | 209thof 2,941 |
| March 2026 | 8829.2 µg/m³ | 297thof 2,971 |
| January 2023 | 8829.1 µg/m³ | 68thof 1,261 |
| March 2025 | 8728.3 µg/m³ | 337thof 2,862 |
| June 2024 | 8627.7 µg/m³ | 47thof 2,563 |
| April 2025 | 8527.4 µg/m³ | 198thof 2,951 |
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.
Tocopilla's worst days
| Day | US AQI |
|---|---|
| 6 Dec 2024 | 18299.2 µg/m³ |
| 24 Jun 2024 | 16474.2 µg/m³ |
| 10 Apr 2025 | 16473.6 µg/m³ |
| 3 Apr 2026 | 15662.3 µg/m³ |
| 2 Dec 2024 | 15460.3 µg/m³ |
| 26 Apr 2024 | 15357.8 µg/m³ |
| 25 Jun 2024 | 15155.6 µg/m³ |
| 11 Mar 2026 | 14954.8 µg/m³ |
| 27 Mar 2026 | 14954.8 µg/m³ |
| 15 Apr 2026 | 14151.6 µg/m³ |
Daily means, the highest since 2 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, Tocopilla, Chile, 2 Jan 2023 – 11 Oct 2026. Monitor data from Chile - SINCA via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/cl/tocopilla/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.
Tocopilla now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 18:07 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).