SmogRank / Peru / Lima Province / Lima
Lima, month by month
Lima has a measured daily mean on 962 days since 1 January 2023. Its worst month was July 2024, at 109 US AQI (38.8 µg/m³), 46th of 2,566 cities on that month's world ranking. Its cleanest was February 2026, at 63 US AQI (15.6 µg/m³). 2025 averaged 84 US AQI (27.0 µg/m³), against 87 US AQI (28.4 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
19 months
| Month | Why |
|---|---|
| Oct 2026 | 5 of 11 days measured; a month needs 8. The others: 6 with readings for part of the day (a day needs 18 hours). |
| Sep 2026 | 3 of 30 days measured; a month needs 21. The others: 3 with no readings from the monitor, 24 with readings for part of the day (a day needs 18 hours). |
| Aug 2026 | 11 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks. |
| Jul 2026 | 10 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks. |
| Aug 2025 | 16 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks. |
| May 2025 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Apr 2025 | 16 of 30 days measured; a month needs 21. The others: 14 with under 18 hours of readings or readings that failed our checks. |
| Sep 2024 | 11 of 30 days measured; a month needs 21. The others: 19 with under 18 hours of readings or readings that failed our checks. |
| Jun 2024 | 6 of 30 days measured; a month needs 21. The others: 24 with under 18 hours of readings or readings that failed our checks. |
| Mar 2024 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Dec 2023 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Nov 2023 | 5 of 30 days measured; a month needs 21. The others: 25 with under 18 hours of readings or readings that failed our checks. |
| Oct 2023 | 16 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks. |
| Jul 2023 | 20 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 10 with under 18 hours of readings or readings that failed our checks. |
| Jun 2023 | 17 of 30 days measured; a month needs 21. The others: 13 with under 18 hours of readings or readings that failed our checks. |
| May 2023 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Apr 2023 | 14 of 30 days measured; a month needs 21. The others: 3 missing from OpenAQ's archive, 13 with under 18 hours of readings or readings that failed our checks. |
| Mar 2023 | 8 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive, 3 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.
Lima's worst months
| Month | US AQI | World rank |
|---|---|---|
| July 2024 | 10938.8 µg/m³ | 46thof 2,566 |
| September 2025 | 10135.6 µg/m³ | 52ndof 3,104 |
| May 2024 | 9934.9 µg/m³ | 54thof 2,684 |
| October 2024 | 9834.3 µg/m³ | 25thof 2,020 |
| December 2025 | 9130.5 µg/m³ | 307thof 3,006 |
| August 2024 | 9130.4 µg/m³ | 48thof 2,010 |
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.
Lima's worst days
| Day | US AQI |
|---|---|
| 27 Jun 2024 | 18197.9 µg/m³ |
| 26 Jun 2024 | 16068.6 µg/m³ |
| 30 Jun 2024 | 15764.3 µg/m³ |
| 1 Jan 2026 | 15358.3 µg/m³ |
| 13 Jul 2024 | 15257.2 µg/m³ |
| 28 May 2025 | 15156.1 µg/m³ |
| 14 Aug 2025 | 15156.0 µg/m³ |
| 12 Jul 2024 | 15155.8 µg/m³ |
| 29 Jun 2024 | 14754.0 µg/m³ |
| 17 Jun 2023 | 14352.4 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, Lima, Peru, 1 Jan 2023 – 10 Oct 2026. Monitor data from Senamhi via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/pe/lima/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.
Lima 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).