SmogRank / United States / Colorado / Lamar
Lamar, month by month
Lamar has a measured daily mean on 968 days since 22 January 2024. Its worst month was July 2024, at 52 US AQI (9.9 µg/m³), 766th of 2,566 cities on that month's world ranking. Its cleanest was November 2024, at 18 US AQI (3.3 µg/m³). 2025 averaged 30 US AQI (5.4 µg/m³), against 32 US AQI (5.7 µg/m³) in 2024.
Every month since 2024
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
1 month
| Month | Why |
|---|---|
| Jan 2024 | 9 of 31 days measured; a month needs 22. The others: 1 with readings for part of the day (a day needs 18 hours). |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Lamar's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2024 | 529.9 µg/m³ | 766thof 2,566 | North-western United States and Canada, July 2024 |
| October 2024 | 509.0 µg/m³ | 634thof 2,020 | – |
| August 2026 | 468.3 µg/m³ | 1,481stof 2,896 | – |
| July 2026 | 427.6 µg/m³ | 1,988thof 2,784 | – |
| August 2025 | 417.3 µg/m³ | 2,059thof 2,901 | – |
| August 2024 | 407.2 µg/m³ | 1,489thof 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.
Lamar's worst days
| Day | US AQI | Episode |
|---|---|---|
| 14 Mar 2025 | 16271.3 µg/m³ | – |
| 25 Jul 2024 | 9935.0 µg/m³ | North-western United States and Canada, July 2024 |
| 24 Jul 2024 | 9834.4 µg/m³ | North-western United States and Canada, July 2024 |
| 18 Mar 2025 | 8929.4 µg/m³ | – |
| 23 Jul 2024 | 8326.4 µg/m³ | North-western United States and Canada, July 2024 |
| 4 Aug 2026 | 8024.8 µg/m³ | – |
| 9 Oct 2024 | 7321.1 µg/m³ | – |
| 8 Oct 2024 | 7321.0 µg/m³ | – |
| 6 Oct 2024 | 7120.0 µg/m³ | – |
| 26 Jul 2024 | 6918.7 µg/m³ | North-western United States and Canada, July 2024 |
Daily means, the highest since 22 Jan 2024; 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, Lamar, United States, 22 Jan 2024 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/lamar/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.
Lamar 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).