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!
February Air Quality Analysis
Wilmington, Illinois, United States
AQI Trends: Highest and Lowest
Same Day Analysis (13th February):
On this day, AQI across the 1 years varied significantly: 2026 ranks 1st highest AQI at 48 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 12th Feb - 13th Feb 2026
Wilmington, Illinois, United States
7 AM12th Feb 2026
5 PM
6 AM13th Feb 2026
64AQI
28AQI
53AQI
21AQI
In the last 24 hours,
Wilmington's AQI reached its highest point of 64 at 6 AM during the Day, while the lowest point, 21, was recorded at 4 AM during the Night between 12th Feb and 13th Feb 2026.
Day & Night AQI Trend : Jan - Feb 2026
Wilmington, Illinois, United States
-6°C-10/-1°C
-1°C-5/3°C
-7°C-9/-7°C
-9°C-12/-7°C
-13°C-17/-11°C
-9°C-16/-2°C
-1°C-4/3°C
-5°C-9/1°C
-17°C-21/-14°C
-17°C-22/-11°C
-13°C-16/-8°C
-15°C-18/-11°C
-11°C-14/-7°C
-13°C-17/-6°C
-13°C-18/-5°C
-13°C-19/-7°C
-9°C-14/-4°C
-8°C-14/-1°C
-5°C-8/-1°C
-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
52AQI
36AQI
50AQI
28AQI
2026 Days Vs Air Quality
Wilmington, Illinois, United States
89%
39
11%
5
Total number of days with different AQI categories in last 45 days in 2026 (320 days remaining)
Under WHO’s Safe Air Quality Limits: 89%
Health Risk Level:
Low
In 2026, 89% of 45 days were within WHO’s safe air quality limits. The risk of health issues is Low, but the long-term effects, especially on vulnerable individuals, remain uncertain.
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)
49AQI (US)
47AQI (US)
36AQI (US)
42AQI (US)
50AQI (US)
58AQI (US)
42AQI (US)
45AQI (US)
50AQI (US)
48AQI (US)
43AQI (US)
51AQI (US)
46AQI (US)
38AQI (US)
41AQI (US)
47AQI (US)
47AQI (US)
37AQI (US)
38AQI (US)
48AQI (US)
33AQI (US)
45AQI (US)
No. of days
202637AQI (US)
Highest AQI (US) recorded in
February45AQI (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) (37) shows an average percentage change of -5.5% (improved AQI (US)) compared to previous years: 2025 (39).