Wilmington, Illinois, United States Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
March Air Quality Analysis
Wilmington, Illinois, United States
AQI Trends: Highest and Lowest
Same Day Analysis (4th March):
On this day, AQI across the 2 years varied significantly: 2026 ranks 1st highest AQI at 46 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 3rd Mar - 4th Mar 2026
Wilmington, Illinois, United States
6 AM3rd Mar 2026
5 PM
5 AM4th Mar 2026
56AQI
30AQI
72AQI
30AQI
In the last 24 hours,
Wilmington's AQI reached its highest point of 72 at 7 PM during the Night, while the lowest point, 30, was recorded at 4 AM during the Night between 3rd Mar and 4th Mar 2026.
Day & Night AQI Trend : Feb - Mar 2026
Wilmington, Illinois, United States
-4°C-8/1°C
-7°C-13/-3°C
-6°C-10/-2°C
1°C-3/5°C
-4°C-10/1°C
-2°C-5/4°C
0°C-6/9°C
5°C1/11°C
2°C-4/9°C
2°C-3/9°C
4°C-5/16°C
5°C-1/17°C
7°C0/18°C
10°C1/21°C
10°C3/20°C
14°C8/22°C
9°C1/17°C
1°C-3/2°C
-2°C-6/1°C
-4°C-7/-2°C
-5°C-8/-1°C
-1°C-8/10°C
2°C-2/8°C
2°C-2/10°C
9°C-3/23°C
4°C-2/10°C
1°C-3/7°C
2°C-3/11°C
4°C2/7°C
5°C2/7°C
63AQI
38AQI
57AQI
32AQI
2026 Days Vs Air Quality
Wilmington, Illinois, United States
90%
57
10%
6
Total number of days with different AQI categories in last 64 days in 2026 (301 days remaining)
Under WHO’s Safe Air Quality Limits: 90%
Health Risk Level:
Very Low
In 2026, 90% of 64 days were within WHO’s safe air quality limits. The risk of health issues is Very Low, but health impacts are still unclear.
Annual Air Quality Insights
Wilmington, Illinois, United States
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
20AQI (US)
22AQI (US)
29AQI (US)
26AQI (US)
42AQI (US)
57AQI (US)
48AQI (US)
40AQI (US)
21AQI (US)
26AQI (US)
19AQI (US)
18AQI (US)
22AQI (US)
16AQI (US)
16AQI (US)
17AQI (US)
16AQI (US)
13AQI (US)
22AQI (US)
24AQI (US)
30AQI (US)
60AQI (US)
58AQI (US)
48AQI (US)
50AQI (US)
47AQI (US)
36AQI (US)
42AQI (US)
50AQI (US)
58AQI (US)
41AQI (US)
45AQI (US)
50AQI (US)
47AQI (US)
43AQI (US)
51AQI (US)
46AQI (US)
39AQI (US)
41AQI (US)
47AQI (US)
47AQI (US)
38AQI (US)
38AQI (US)
48AQI (US)
49AQI (US)
47AQI (US)
45AQI (US)
47AQI (US)
44AQI (US)
43AQI (US)
38AQI (US)
35AQI (US)
36AQI (US)
38AQI (US)
45AQI (US)
43AQI (US)
34AQI (US)
34AQI (US)
33AQI (US)
39AQI (US)
56AQI (US)
43AQI (US)
46AQI (US)
33AQI (US)
43AQI (US)
46AQI (US)
No. of days
202638AQI (US)
Highest AQI (US) recorded in
March46AQI (US)
Lowest AQI (US) recorded in
January33AQI (US)
202539AQI (US)
Highest AQI (US) recorded in
June51AQI (US)
Lowest AQI (US) recorded in
May28AQI (US)
Most & Least Polluted Years Over the Last 2 Years
Wilmington's annual 2026 AQI (US) (38) shows an average percentage change of -1.4% (improved AQI (US)) compared to previous years: 2025 (39).