SmogRank / Chile / Arica y Parinacota Region / Arica
Arica, month by month
Arica has a measured daily mean on 1,180 days since 1 January 2023. Its worst month was January 2026, at 88 US AQI (29.1 µg/m³), 185th of 2,617 cities on that month's world ranking. Its cleanest was May 2024, at 69 US AQI (18.9 µg/m³). 2025 averaged 75 US AQI (22.2 µg/m³), against 71 US AQI (20.1 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
5 months
| Month | Why |
|---|---|
| Oct 2023 | 21 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Aug 2023 | 21 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Apr 2023 | 20 of 30 days measured; a month needs 21. The others: 3 missing from OpenAQ's archive, 7 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.
Arica's worst months
| Month | US AQI | World rank |
|---|---|---|
| January 2026 | 8829.1 µg/m³ | 185thof 2,617 |
| December 2025 | 8627.7 µg/m³ | 331stof 3,006 |
| November 2025 | 8125.1 µg/m³ | 295thof 2,715 |
| March 2026 | 8024.5 µg/m³ | 444thof 2,971 |
| April 2026 | 8024.4 µg/m³ | 314thof 2,941 |
| October 2025 | 7723.1 µg/m³ | 240thof 2,614 |
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.
Arica's worst days
| Day | US AQI |
|---|---|
| 25 Dec 2025 | 11440.7 µg/m³ |
| 1 Jan 2026 | 11340.5 µg/m³ |
| 24 Dec 2025 | 11239.8 µg/m³ |
| 19 Nov 2025 | 10637.6 µg/m³ |
| 9 Jan 2026 | 10537.0 µg/m³ |
| 26 Dec 2025 | 9934.7 µg/m³ |
| 20 Dec 2025 | 9734.0 µg/m³ |
| 6 Jan 2026 | 9633.5 µg/m³ |
| 10 Jan 2026 | 9532.7 µg/m³ |
| 20 Nov 2025 | 9532.6 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, Arica, Chile, 1 Jan 2023 – 11 Oct 2026. Monitor data from Chile - SINCA via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/cl/arica/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.
Arica now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 23:07 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).