Aurora, IL Air Quality in April
Across 2019–2025, Aurora's April air quality had a median AQI of 54 (Moderate) over 210 monitored days in the Chicago-Naperville-Elgin, IL-IN-WI area. 2.4% of April days (5 of 210) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 66.2% of days. The cleanest April on record here was 2024 (median AQI 50, 0 days above 100) and the worst was 2021 (median 59, 2 days above 100, peak AQI 175).
- Good: 37.1%
- Moderate: 60.5%
- Unhealthy for Sensitive Groups: 1.4%
- Unhealthy or worse: 1.0%
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How is the air in Aurora in April?
Moderate on a typical day: median AQI 54 across 2019–2025, with 2.4% of April days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓37.1% of April days were Good (AQI 0–50), 60.5% Moderate (51–100).
- ✓5 days of 210 reached AQI 101+; the April peak was 219.
- ✓Best April: 2024; worst April: 2021.
Frequently asked questions
What is the air quality like in Aurora in April?▾
Across 2019–2025, the median daily AQI in Aurora in April was 54 (Moderate). 37.1% of days were Good, 60.5% Moderate, and 2.4% reached Unhealthy for Sensitive Groups or worse, based on 210 monitored days in EPA's Air Quality System.
Is April a good time for outdoor exercise in Aurora?▾
A typical April day in Aurora is Moderate (median AQI 54): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 42 of April days (2.4%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Aurora's April air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 66.2% of April days in Aurora. The highest April AQI recorded in 2019–2025 was 219 (Very Unhealthy), in 2021.
Aurora April air quality, year by year
Aurora April air quality by year (Chicago-Naperville-Elgin, IL-IN-WI, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 30 | 56 | 0 | 97 | PM2.5 |
| 2020 | 30 | 59 | 0 | 81 | PM2.5 |
| 2021worst | 30 | 59 | 2 | 175 | PM2.5 |
| 2022 | 30 | 52 | 0 | 74 | PM2.5 |
| 2023 | 30 | 59 | 1 | 143 | PM2.5 |
| 2024cleanest | 30 | 50 | 0 | 74 | O3 |
| 2025 | 30 | 53 | 2 | 219 | PM2.5 |
What April air means in Aurora
A typical April day in Aurora is Moderate (median AQI 54): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 42 of April days (2.4%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
April's median AQI of 54 is below Aurora's whole-year median of 60, making it one of the area's cleaner periods. Nationally, the median April AQI across every EPA metro area (100,677 metro-days, 2019–2025) is 44, so Aurora runs above the national April norm; 2.4% of its April days topped AQI 100 versus 0.7% nationally (above average).
April is part of Aurora's spring season (March, April, May); the spring page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Aurora
The latest EPA AirNow observation puts Aurora's AQI at 39 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Aurora air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Chicago-Naperville-Elgin, IL-IN-WI), 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.