SmogRank / Mexico / Baja California Sur / La Paz
La Paz, month by month
La Paz, Baja California Sur has a measured daily mean on 407 days since 20 January 2025. Its worst month was September 2025, at 58 US AQI (13.0 µg/m³), 403rd of 3,104 cities on that month's world ranking. Its cleanest was July 2025, at 41 US AQI (7.3 µg/m³).
Every month since 2025
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
10 months
| Month | Why |
|---|---|
| Oct 2026 | No day measured. The others: 11 with no readings from the monitor. |
| Sep 2026 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Aug 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jul 2026 | 2 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks. |
| May 2026 | 19 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| Oct 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. |
| Jun 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. |
| Mar 2025 | 11 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks. |
| Feb 2025 | No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks. |
| Jan 2025 | 1 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
La Paz's worst months
| Month | US AQI | World rank |
|---|---|---|
| September 2025 | 5813.0 µg/m³ | 403rdof 3,104 |
| November 2025 | 5712.2 µg/m³ | 746thof 2,715 |
| December 2025 | 5511.3 µg/m³ | 1,072ndof 3,006 |
| February 2026 | 5511.1 µg/m³ | 1,172ndof 2,866 |
| April 2025 | 5410.9 µg/m³ | 957thof 2,951 |
| May 2025 | 5310.3 µg/m³ | 809thof 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.
La Paz's worst days
| Day | US AQI |
|---|---|
| 25 Dec 2025 | 7924.1 µg/m³ |
| 12 Nov 2025 | 7923.9 µg/m³ |
| 10 Sept 2025 | 7421.5 µg/m³ |
| 20 Sept 2025 | 7321.1 µg/m³ |
| 11 Sept 2025 | 7120.0 µg/m³ |
| 2 Jun 2026 | 7119.8 µg/m³ |
| 13 Nov 2025 | 7019.1 µg/m³ |
| 24 Dec 2025 | 6918.9 µg/m³ |
| 2 Feb 2026 | 6918.9 µg/m³ |
| 9 Sept 2025 | 6918.7 µg/m³ |
Daily means, the highest since 20 Jan 2025; 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, La Paz, Baja California Sur, Mexico, 20 Jan 2025 – 2 Jul 2026. Monitor data from Sinaica Mexico via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/mx/la-paz/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.
La Paz 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).