Wilmington, Delaware, 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, Delaware, United States
AQI Trends: Highest and Lowest
Same Day Analysis (5th February):
On this day, AQI across the 5 years varied significantly: 2026 ranks 1st highest AQI at 47 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 4th Feb - 5th Feb 2026
Wilmington, Delaware, United States
7 AM4th Feb 2026
5 PM
6 AM5th Feb 2026
58AQI
46AQI
62AQI
32AQI
In the last 24 hours,
Wilmington's AQI reached its highest point of 62 at 8 PM during the Night, while the lowest point, 32, was recorded at 4 AM during the Night between 4th Feb and 5th Feb 2026.
Day & Night AQI Trend : Jan - Feb 2026
Wilmington, Delaware, United States
7°C2/13°C
7°C2/12°C
7°C1/12°C
7°C5/10°C
5°C0/8°C
2°C-1/8°C
4°C0/12°C
8°C4/14°C
1°C-5/4°C
-2°C-5/3°C
1°C0/3°C
-1°C-5/1°C
-3°C-8/1°C
-7°C-11/-2°C
-4°C-12/6°C
5°C0/12°C
1°C-9/7°C
-10°C-13/-6°C
-8°C-12/-1°C
-7°C-11/-4°C
-9°C-14/-4°C
-11°C-15/-5°C
-12°C-17/-7°C
-13°C-18/-8°C
-12°C-18/-6°C
-10°C-15/-5°C
-6°C-12/1°C
-4°C-9/1°C
-2°C-8/2°C
-5°C-10/0°C
47AQI
41AQI
44AQI
38AQI
2026 Days Vs Air Quality
Wilmington, Delaware, United States
81%
29
19%
7
Total number of days with different AQI categories in last 37 days in 2026 (328 days remaining)
Under WHO’s Safe Air Quality Limits: 81%
Health Risk Level:
Low
In 2026, 81% of 37 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, Delaware, United States
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
18AQI (US)
28AQI (US)
46AQI (US)
53AQI (US)
49AQI (US)
61AQI (US)
55AQI (US)
41AQI (US)
50AQI (US)
39AQI (US)
20AQI (US)
19AQI (US)
35AQI (US)
38AQI (US)
29AQI (US)
19AQI (US)
33AQI (US)
72AQI (US)
37AQI (US)
21AQI (US)
31AQI (US)
49AQI (US)
53AQI (US)
48AQI (US)
48AQI (US)
48AQI (US)
44AQI (US)
47AQI (US)
55AQI (US)
53AQI (US)
47AQI (US)
47AQI (US)
50AQI (US)
49AQI (US)
50AQI (US)
47AQI (US)
41AQI (US)
49AQI (US)
No. of days
202642AQI (US)
Highest AQI (US) recorded in
February49AQI (US)
Lowest AQI (US) recorded in
January41AQI (US)
202533AQI (US)
Highest AQI (US) recorded in
December41AQI (US)
Lowest AQI (US) recorded in
May23AQI (US)
202434AQI (US)
Highest AQI (US) recorded in
January38AQI (US)
Lowest AQI (US) recorded in
November28AQI (US)
202342AQI (US)
Highest AQI (US) recorded in
June72AQI (US)
Lowest AQI (US) recorded in
September33AQI (US)
202237AQI (US)
Highest AQI (US) recorded in
January44AQI (US)
Lowest AQI (US) recorded in
September30AQI (US)
202140AQI (US)
Highest AQI (US) recorded in
July53AQI (US)
Lowest AQI (US) recorded in
October33AQI (US)
202037AQI (US)
Highest AQI (US) recorded in
November43AQI (US)
Lowest AQI (US) recorded in
September31AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Wilmington's annual 2026 AQI (US) (42) shows an average percentage change of 16.1% (worsened AQI (US)) compared to previous years: 2020 (37), 2021 (40), 2022 (37), 2023 (42), 2024 (34), 2025 (33).