Toledo Best & Worst AQI Days: Air Quality Guide
The worst air quality day on record for Toledo (Toledo, OH area) was June 28, 2023, when the daily AQI reached 190 (Unhealthy), set by fine particulate matter (PM2.5), in wildfire smoke season. Across 2,528 monitored days in 2019–2025, 3 of the 10 worst days were Unhealthy (AQI 151+) or worse; 5 of the 10 were driven by ground-level ozone and 5 by fine particulate matter (PM2.5), and 4 of them fell in 2023. The cleanest day was November 10, 2025 at AQI 12 (Good); the 10 best days span 3 different years.
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When were Toledo's worst and best air quality days?
Worst: June 28, 2023, AQI 190 (Unhealthy, PM2.5). Best: November 10, 2025, AQI 12 (Good). Based on 2,528 EPA-monitored days in the Toledo, OH area, 2019–2025.
- ✓3 of the 10 worst days were Unhealthy (AQI 151+) or worse; the 10th-worst was AQI 130 (Unhealthy for Sensitive Groups).
- ✓Ground-level ozone drove 5 of the 10 worst days.
- ✓2023 accounts for 4 of the 10 worst days.
Frequently asked questions
What was the worst air quality day in Toledo?▾
June 28, 2023: the Toledo, OH area's daily AQI hit 190 (Unhealthy), driven by fine particulate matter (PM2.5), in wildfire smoke season. That is the highest of 2,528 monitored days in 2019–2025.
What was the best air quality day in Toledo?▾
November 10, 2025, with a daily AQI of 12 (Good). The daily AQI is the highest reading from any monitor in the area, so even the cleanest day reflects the area's worst monitor.
What was Toledo's worst air quality day in 2025?▾
July 15, 2025, AQI 154 (Unhealthy), set by ground-level ozone, in peak ozone season.
Which pollutant causes Toledo's worst air days?▾
Ground-level ozone set the AQI on 5 of the 10 worst days; fine particulate matter (PM2.5) on 5. The tables above list the defining pollutant for every day.
Toledo's 10 worst air quality days, 2019–2025
Highest daily AQI recorded for the Toledo, OH area (EPA AQS). The daily AQI is the highest reading from any monitor in the area that day.
| # | Date | AQI | Category | Defining pollutant |
|---|---|---|---|---|
| 1 | (2023 page) | 190 | Unhealthy | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
| 2 | (2023 page) | 182 | Unhealthy | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
| 3 | (2025 page) | 154 | Unhealthy | O3 — ground-level ozone, in peak ozone season |
| 4 | (2023 page) | 144 | Unhealthy for Sensitive Groups | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
| 5 | (2019 page) | 143 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season |
| 6 | (2025 page) | 136 | Unhealthy for Sensitive Groups | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
| 7 | (2023 page) | 136 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season |
| 8 | (2020 page) | 136 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season |
| 9 | (2020 page) | 133 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season |
| 10 | (2020 page) | 130 | Unhealthy for Sensitive Groups | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
Worst day of each year in Toledo
The single highest-AQI day in each year on record. Click a year for its full month-by-month statistics.
| Year | Worst day | AQI | Category | Defining pollutant |
|---|---|---|---|---|
| 2019 | 143 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season | |
| 2020 | 136 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season | |
| 2021 | 122 | Unhealthy for Sensitive Groups | O3 — ground-level ozone | |
| 2022 | 119 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season | |
| 2023 | 190 | Unhealthy | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season | |
| 2024 | 119 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season | |
| 2025 | 154 | Unhealthy | O3 — ground-level ozone, in peak ozone season |
Toledo's 10 best air quality days, 2019–2025
Lowest daily AQI recorded for the Toledo, OH area. Ties are listed most recent first.
| # | Date | AQI | Category | Defining pollutant |
|---|---|---|---|---|
| 1 | (2025 page) | 12 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 2 | (2023 page) | 12 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 3 | (2023 page) | 13 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 4 | (2023 page) | 13 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 5 | (2024 page) | 14 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 6 | (2023 page) | 14 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 7 | (2023 page) | 15 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 8 | (2023 page) | 15 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 9 | (2025 page) | 16 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 10 | (2025 page) | 16 | Good | PM2.5 — fine particulate matter (PM2.5) |
Right now in Toledo
The latest EPA AirNow observation puts Toledo's AQI at 33 (PM2.5). The days above are historical records, not today's reading.
View current Toledo air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Toledo, OH), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.