SmogRank / United States / New Jersey / Smithville
Smithville, month by month
Smithville has a measured daily mean on 1,229 days since 1 January 2023. Its worst month was June 2023, at 78 US AQI (23.5 µg/m³), 200th of 1,603 cities on that month's world ranking. Its cleanest was February 2025, at 21 US AQI (3.8 µg/m³). 2025 averaged 32 US AQI (5.7 µg/m³), against 32 US AQI (5.8 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
4 months
| Month | Why |
|---|---|
| Jun 2024 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| May 2024 | 21 of 31 days measured; a month needs 22. The others: 10 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: 20 missing from OpenAQ's archive. |
| 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.
Smithville's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| June 2023 | 7823.5 µg/m³ | 200thof 1,603 | Eastern United States and Canada, June and July 2023 Eastern United States and Canada, May and June 2023 |
| July 2026 | 6114.2 µg/m³ | 575thof 2,784 | Northern United States and Canada, July 2026 |
| July 2023 | 5511.4 µg/m³ | 479thof 1,432 | Eastern United States and Canada, June and July 2023 |
| August 2023 | 529.7 µg/m³ | 668thof 1,980 | – |
| June 2025 | 529.5 µg/m³ | 1,450thof 2,508 | – |
| August 2024 | 509.0 µg/m³ | 874thof 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.
Smithville's worst days
| Day | US AQI | Episode |
|---|---|---|
| 8 Jun 2023 | 223148.0 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 7 Jun 2023 | 195118.0 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 17 Jul 2026 | 16980.6 µg/m³ | Northern United States and Canada, July 2026 |
| 2 Jun 2023 | 15155.5 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 16 Jul 2026 | 14252.3 µg/m³ | Northern United States and Canada, July 2026 |
| 18 Jul 2026 | 13750.1 µg/m³ | Northern United States and Canada, July 2026 |
| 29 Jun 2023 | 11340.2 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 30 Jun 2023 | 10838.3 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 26 Jul 2025 | 9633.4 µg/m³ | North-eastern United States and Canada, 24 to 28 July 2025 |
| 19 Oct 2024 | 8627.9 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, Smithville, United States, 1 Jan 2023 – 9 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/smithville-new-jersey/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.
Smithville now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 04:07 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).