Bellingham, Washington, 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
Bellingham, Washington, United States
AQI Trends: Highest and Lowest
Same Day Analysis (11th March):
On this day, AQI across the 5 years varied significantly: 2026 ranks 1st highest AQI at 41 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 10th Mar - 11th Mar 2026
Bellingham, Washington, United States
7 AM10th Mar 2026
5 PM
6 AM11th Mar 2026
55AQI
9AQI
50AQI
30AQI
In the last 24 hours,
Bellingham's AQI reached its highest point of 55 at 5 PM during the Day, while the lowest point, 9, was recorded at 10 AM during the Day between 10th Mar and 11th Mar 2026.
Day & Night AQI Trend : Feb - Mar 2026
Bellingham, Washington, United States
8°C4/14°C
5°C1/10°C
6°C2/12°C
7°C5/8°C
5°C1/10°C
4°C0/9°C
4°C1/8°C
3°C0/8°C
2°C0/5°C
1°C-1/5°C
0°C-4/7°C
5°C1/12°C
9°C5/13°C
7°C4/11°C
4°C0/9°C
6°C3/11°C
7°C6/10°C
7°C6/9°C
7°C4/11°C
6°C1/15°C
7°C2/14°C
9°C6/12°C
9°C7/10°C
8°C6/13°C
8°C7/10°C
10°C9/12°C
8°C4/10°C
4°C1/7°C
3°C1/5°C
6°C4/9°C
43AQI
31AQI
35AQI
25AQI
2026 Days Vs Air Quality
Bellingham, Washington, United States
97%
68
3%
2
Total number of days with different AQI categories in last 71 days in 2026 (294 days remaining)
Under WHO’s Safe Air Quality Limits: 97%
Health Risk Level:
Very Low
In 2026, 97% of 71 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
Bellingham, Washington, United States
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
51AQI (US)
51AQI (US)
23AQI (US)
15AQI (US)
20AQI (US)
17AQI (US)
12AQI (US)
16AQI (US)
17AQI (US)
20AQI (US)
16AQI (US)
15AQI (US)
20AQI (US)
22AQI (US)
24AQI (US)
21AQI (US)
36AQI (US)
38AQI (US)
37AQI (US)
38AQI (US)
36AQI (US)
35AQI (US)
38AQI (US)
34AQI (US)
27AQI (US)
29AQI (US)
23AQI (US)
23AQI (US)
46AQI (US)
44AQI (US)
44AQI (US)
50AQI (US)
40AQI (US)
44AQI (US)
33AQI (US)
31AQI (US)
34AQI (US)
28AQI (US)
32AQI (US)
27AQI (US)
30AQI (US)
25AQI (US)
21AQI (US)
29AQI (US)
36AQI (US)
31AQI (US)
35AQI (US)
39AQI (US)
32AQI (US)
31AQI (US)
29AQI (US)
25AQI (US)
30AQI (US)
32AQI (US)
30AQI (US)
35AQI (US)
34AQI (US)
20AQI (US)
20AQI (US)
26AQI (US)
32AQI (US)
25AQI (US)
39AQI (US)
36AQI (US)
35AQI (US)
43AQI (US)
41AQI (US)
36AQI (US)
32AQI (US)
41AQI (US)
29AQI (US)
32AQI (US)
35AQI (US)
No. of days
202631AQI (US)
Highest AQI (US) recorded in
March35AQI (US)
Lowest AQI (US) recorded in
January29AQI (US)
202528AQI (US)
Highest AQI (US) recorded in
October36AQI (US)
Lowest AQI (US) recorded in
May20AQI (US)
202424AQI (US)
Highest AQI (US) recorded in
August30AQI (US)
Lowest AQI (US) recorded in
June18AQI (US)
202321AQI (US)
Highest AQI (US) recorded in
August29AQI (US)
Lowest AQI (US) recorded in
January15AQI (US)
202225AQI (US)
Highest AQI (US) recorded in
October48AQI (US)
Lowest AQI (US) recorded in
May14AQI (US)
202118AQI (US)
Highest AQI (US) recorded in
August31AQI (US)
Lowest AQI (US) recorded in
June11AQI (US)
202026AQI (US)
Highest AQI (US) recorded in
September61AQI (US)
Lowest AQI (US) recorded in
August18AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Bellingham's annual 2026 AQI (US) (31) shows an average percentage change of 33.1% (worsened AQI (US)) compared to previous years: 2020 (26), 2021 (18), 2022 (25), 2023 (21), 2024 (24), 2025 (28).