SmogRank / United States / South Carolina / Red Hill
Red Hill, month by month
Red Hill has a measured daily mean on 1,105 days since 19 March 2023. Its worst month was March 2025, at 64 US AQI (16.0 µg/m³), 860th of 2,862 cities on that month's world ranking. Its cleanest was May 2026, at 21 US AQI (3.7 µg/m³). 2024 averaged 39 US AQI (7.0 µg/m³), against 47 US AQI (8.5 µg/m³) in 2023.
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
8 months
| Month | Why |
|---|---|
| Oct 2026 | 2 of 11 days measured; a month needs 8. The others: 6 with no readings from the monitor, 3 with readings for part of the day (a day needs 18 hours). |
| Sep 2026 | 11 of 30 days measured; a month needs 21. The others: 19 with under 18 hours of readings or readings that failed our checks. |
| Aug 2026 | 17 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks. |
| Dec 2025 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Nov 2025 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Oct 2025 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Sep 2025 | 3 of 30 days measured; a month needs 21. The others: 27 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: 2 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Red Hill's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| March 2025 | 6416.0 µg/m³ | 860thof 2,862 | – |
| June 2023 | 5913.4 µg/m³ | 461stof 1,603 | United States and Canada, June 2023 Eastern United States and Canada, May and June 2023 |
| February 2025 | 5310.0 µg/m³ | 1,186thof 2,633 | Georgia, South Carolina and Alabama, United States, February 2025 |
| November 2023 | 498.9 µg/m³ | 889thof 2,243 | – |
| July 2023 | 498.8 µg/m³ | 782ndof 1,432 | – |
| August 2023 | 498.8 µg/m³ | 812thof 1,980 | – |
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.
Red Hill's worst days
| Day | US AQI | Episode |
|---|---|---|
| 2 Mar 2025 | 17081.9 µg/m³ | – |
| 3 Mar 2025 | 16271.1 µg/m³ | – |
| 28 Mar 2025 | 15763.6 µg/m³ | – |
| 4 Mar 2025 | 14653.6 µg/m³ | – |
| 10 Jun 2023 | 9130.6 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 18 Jun 2023 | 9030.2 µg/m³ | United States and Canada, June 2023 |
| 9 Jun 2023 | 8929.6 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 26 Feb 2025 | 8829.0 µg/m³ | Georgia, South Carolina and Alabama, United States, February 2025 |
| 14 Mar 2024 | 8828.9 µg/m³ | Eastern United States, March 2024 |
| 16 Jan 2025 | 8628.0 µg/m³ | – |
Daily means, the highest since 19 Mar 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, Red Hill, United States, 19 Mar 2023 – 5 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/red-hill-south-carolina/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.
Red Hill now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 19:07 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).