Chelsea, Massachusetts, United States Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
August Air Quality Analysis
Chelsea, Massachusetts, United States
AQI Trends: Highest and Lowest
Same Day Analysis (31st August ):
On this day, AQI across the 4 years varied significantly: 2025 ranks 1st highest AQI at 24 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report
2025 Days Vs Air Quality
Chelsea, Massachusetts, United States
87%
184
13%
28
Total number of days with different AQI categories in last 213 days in 2025 (152 days remaining)
Under WHO’s Safe Air Quality Limits: 87%
Health Risk Level:
Low
In 2025, 87% of 213 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
Chelsea, Massachusetts, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
28AQI
21AQI
21AQI
25AQI
24AQI
21AQI
21AQI
21AQI
23AQI
24AQI
35AQI
38AQI
56AQI
28AQI
24AQI
34AQI
60AQI
45AQI
31AQI
34AQI
55AQI
59AQI
54AQI
56AQI
45AQI
48AQI
28AQI
28AQI
33AQI
32AQI
40AQI
30AQI
28AQI
48AQI
28AQI
24AQI
36AQI
33AQI
32AQI
34AQI
34AQI
48AQI
38AQI
25AQI
28AQI
28AQI
26AQI
28AQI
26AQI
23AQI
27AQI
24AQI
28AQI
43AQI
48AQI
46AQI
29AQI
40AQI
26AQI
29AQI
28AQI
27AQI
37AQI
33AQI
26AQI
29AQI
30AQI
29AQI
29AQI
36AQI
28AQI
22AQI
28AQI
26AQI
36AQI
22AQI
18AQI
24AQI
17AQI
16AQI
21AQI
18AQI
29AQI
31AQI
26AQI
18AQI
21AQI
23AQI
25AQI
38AQI
19AQI
19AQI
27AQI
26AQI
23AQI
22AQI
17AQI
17AQI
15AQI
20AQI
21AQI
18AQI
17AQI
21AQI
32AQI
12AQI
14AQI
22AQI
50AQI
21AQI
16AQI
42AQI
26AQI
23AQI
54AQI
32AQI
12AQI
19AQI
25AQI
22AQI
18AQI
42AQI
47AQI
38AQI
28AQI
34AQI
29AQI
25AQI
34AQI
16AQI
21AQI
22AQI
29AQI
30AQI
40AQI
36AQI
37AQI
19AQI
13AQI
13AQI
18AQI
23AQI
14AQI
14AQI
13AQI
19AQI
27AQI
28AQI
23AQI
34AQI
20AQI
13AQI
18AQI
25AQI
39AQI
58AQI
62AQI
54AQI
88AQI
81AQI
54AQI
52AQI
71AQI
53AQI
47AQI
31AQI
34AQI
30AQI
25AQI
29AQI
34AQI
53AQI
54AQI
52AQI
56AQI
53AQI
38AQI
26AQI
28AQI
41AQI
39AQI
41AQI
34AQI
46AQI
44AQI
50AQI
59AQI
44AQI
37AQI
33AQI
31AQI
32AQI
33AQI
24AQI
25AQI
29AQI
38AQI
40AQI
21AQI
27AQI
21AQI
30AQI
19AQI
25AQI
29AQI
38AQI
76AQI
79AQI
71AQI
60AQI
54AQI
61AQI
35AQI
32AQI
26AQI
23AQI
26AQI
45AQI
40AQI
No. of days
202533AQI
Highest AQI recorded in
June45AQI
Lowest AQI recorded in
April23AQI
202431AQI
Highest AQI recorded in
July39AQI
Lowest AQI recorded in
September25AQI
202335AQI
Highest AQI recorded in
July47AQI
Lowest AQI recorded in
November27AQI
202233AQI
Highest AQI recorded in
January42AQI
Lowest AQI recorded in
September26AQI
202133AQI
Highest AQI recorded in
July42AQI
Lowest AQI recorded in
April26AQI
202034AQI
Highest AQI recorded in
August42AQI
Lowest AQI recorded in
April23AQI
Most & Least Polluted Years Over the Last 6 Years
Chelsea's annual 2025 AQI (33) shows an average percentage change of -1.5% (improved AQI) compared to previous years: 2020 (34), 2021 (33), 2022 (33), 2023 (35), 2024 (31).
