SmogRank / United States / Maryland / South Laurel
South Laurel, month by month
South Laurel has a measured daily mean on 1,278 days since 14 January 2023. Its worst month was June 2023, at 71 US AQI (19.9 µg/m³), 270th of 1,603 cities on that month's world ranking. Its cleanest was March 2024, at 11 US AQI (2.0 µg/m³). 2025 averaged 30 US AQI (5.4 µg/m³), against 27 US AQI (4.9 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 |
|---|---|
| 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. |
| Jan 2023 | 18 of 31 days measured; a month needs 22. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
South Laurel's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| June 2023 | 7119.9 µg/m³ | 270thof 1,603 | Eastern United States and Canada, June and July 2023 Eastern United States and Canada, May and June 2023 |
| July 2026 | 6717.7 µg/m³ | 403rdof 2,784 | Northern United States and Canada, July 2026 |
| August 2026 | 5410.8 µg/m³ | 736thof 2,896 | – |
| November 2023 | 529.5 µg/m³ | 744thof 2,243 | – |
| February 2026 | 519.1 µg/m³ | 1,638thof 2,866 | – |
| July 2023 | 509.0 µg/m³ | 763rdof 1,432 | United States and Canada, July 2023 Eastern United States and Canada, June and July 2023 |
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.
South Laurel's worst days
| Day | US AQI | Episode |
|---|---|---|
| 17 Jul 2026 | 198123.0 µg/m³ | Northern United States and Canada, July 2026 |
| 8 Jun 2023 | 193116.0 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 29 Jun 2023 | 17184.2 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 7 Jun 2023 | 15966.2 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 18 Jul 2026 | 13951.0 µg/m³ | Northern United States and Canada, July 2026 |
| 30 Jun 2023 | 10436.8 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 17 Jul 2023 | 9030.3 µg/m³ | United States and Canada, July 2023 |
| 28 Jun 2023 | 8828.8 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 1 Jul 2023 | 8426.8 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 6 Jun 2023 | 7924.1 µg/m³ | Eastern United States and Canada, May and June 2023 |
Daily means, the highest since 14 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, South Laurel, United States, 14 Jan 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/south-laurel/history (accessed 13 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.
South Laurel now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 01:07 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).