Montgomery Best & Worst AQI Days: Air Quality Guide
The worst air quality day on record for Montgomery (Montgomery, AL area) was June 4, 2019, when the daily AQI reached 122 (Unhealthy for Sensitive Groups), set by ground-level ozone, in peak ozone season. Across 2,493 monitored days in 2019–2025, 0 of the 10 worst days were Unhealthy (AQI 151+) or worse; 6 of the 10 were driven by ground-level ozone and 4 by fine particulate matter (PM2.5), and 3 of them fell in 2020. The cleanest day was December 12, 2022 at AQI 0 (Good); the 10 best days span 3 different years.
Reduce Indoor Ozone in Montgomery
Today's main pollutant in Montgomery is ground-level ozone (AQI 30). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
Recommended: Levoit Core 300 — True HEPA + activated carbon · CADR ~141 CFM · rooms up to 219 sq ft
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When were Montgomery's worst and best air quality days?
Worst: June 4, 2019, AQI 122 (Unhealthy for Sensitive Groups, O3). Best: December 12, 2022, AQI 0 (Good). Based on 2,493 EPA-monitored days in the Montgomery, AL area, 2019–2025.
- ✓0 of the 10 worst days were Unhealthy (AQI 151+) or worse; the 10th-worst was AQI 90 (Moderate).
- ✓Ground-level ozone drove 6 of the 10 worst days.
- ✓2020 accounts for 3 of the 10 worst days.
Frequently asked questions
What was the worst air quality day in Montgomery?▾
June 4, 2019: the Montgomery, AL area's daily AQI hit 122 (Unhealthy for Sensitive Groups), driven by ground-level ozone, in peak ozone season. That is the highest of 2,493 monitored days in 2019–2025.
What was the best air quality day in Montgomery?▾
December 12, 2022, with a daily AQI of 0 (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 Montgomery's worst air quality day in 2025?▾
September 16, 2025, AQI 90 (Moderate), set by ground-level ozone.
Which pollutant causes Montgomery's worst air days?▾
Ground-level ozone set the AQI on 6 of the 10 worst days; fine particulate matter (PM2.5) on 4. The tables above list the defining pollutant for every day.
Montgomery's 10 worst air quality days, 2019–2025
Highest daily AQI recorded for the Montgomery, AL area (EPA AQS). The daily AQI is the highest reading from any monitor in the area that day.
| # | Date | AQI | Category | Defining pollutant |
|---|---|---|---|---|
| 1 | (2019 page) | 122 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season |
| 2 | (2020 page) | 116 | Unhealthy for Sensitive Groups | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
| 3 | (2020 page) | 109 | Unhealthy for Sensitive Groups | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season |
| 4 | (2024 page) | 102 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season |
| 5 | (2022 page) | 96 | Moderate | PM2.5 — fine particulate matter (PM2.5) |
| 6 | (2023 page) | 93 | Moderate | O3 — ground-level ozone, in peak ozone season |
| 7 | (2023 page) | 93 | Moderate | O3 — ground-level ozone, in peak ozone season |
| 8 | (2021 page) | 93 | Moderate | O3 — ground-level ozone |
| 9 | (2020 page) | 93 | Moderate | PM2.5 — fine particulate matter (PM2.5) |
| 10 | (2025 page) | 90 | Moderate | O3 — ground-level ozone |
Worst day of each year in Montgomery
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 | 122 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season | |
| 2020 | 116 | Unhealthy for Sensitive Groups | PM2.5 — fine particulate matter (PM2.5), in wildfire smoke season | |
| 2021 | 93 | Moderate | O3 — ground-level ozone | |
| 2022 | 96 | Moderate | PM2.5 — fine particulate matter (PM2.5) | |
| 2023 | 93 | Moderate | O3 — ground-level ozone, in peak ozone season | |
| 2024 | 102 | Unhealthy for Sensitive Groups | O3 — ground-level ozone, in peak ozone season | |
| 2025 | 90 | Moderate | O3 — ground-level ozone |
Montgomery's 10 best air quality days, 2019–2025
Lowest daily AQI recorded for the Montgomery, AL area. Ties are listed most recent first.
| # | Date | AQI | Category | Defining pollutant |
|---|---|---|---|---|
| 1 | (2022 page) | 0 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 2 | (2024 page) | 3 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 3 | (2025 page) | 4 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 4 | (2024 page) | 4 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 5 | (2024 page) | 6 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 6 | (2024 page) | 6 | Good | PM10 — coarse dust (PM10) |
| 7 | (2024 page) | 7 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 8 | (2025 page) | 8 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 9 | (2022 page) | 8 | Good | PM2.5 — fine particulate matter (PM2.5) |
| 10 | (2022 page) | 8 | Good | PM2.5 — fine particulate matter (PM2.5) |
Right now in Montgomery
The latest EPA AirNow observation puts Montgomery's AQI at 30 (O3). The days above are historical records, not today's reading.
View current Montgomery air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Montgomery, AL), 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.