Longmont, Colorado, 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
Longmont, Colorado, United States
AQI Trends: Highest and Lowest
Same Day Analysis (16th August):
On this day, AQI across the 5 years varied significantly: 2026 ranks 3rd highest AQI at 24 of Good air quality, showing improvement over 2025 and 2024 on the same day.
Day & Night AQI Trend: 16th Aug - 17th Aug 2026
Longmont, Colorado, United States
6 AM16th Aug 2026
8 PM
5 AM17th Aug 2026
38AQI
11AQI
10AQI
8AQI
In the last 24 hours,
Longmont's AQI reached its highest point of 38 at 9 AM during the Day, while the lowest point, 8, was recorded at 2 AM during the Night between 16th Aug and 17th Aug 2026.
Day & Night AQI Trend : Jul - Aug 2026
Longmont, Colorado, United States
27°C16/37°C
28°C18/39°C
27°C21/36°C
24°C19/34°C
24°C19/31°C
26°C17/36°C
28°C19/40°C
29°C22/39°C
25°C21/33°C
23°C17/34°C
22°C17/33°C
25°C16/34°C
26°C18/37°C
25°C15/38°C
28°C17/39°C
28°C19/39°C
19°C13/25°C
18°C7/30°C
24°C12/37°C
25°C14/38°C
27°C16/38°C
27°C18/37°C
25°C18/35°C
26°C18/36°C
23°C17/35°C
19°C15/27°C
20°C13/31°C
21°C16/30°C
23°C13/34°C
25°C13/37°C
44AQI
35AQI
42AQI
38AQI
2026 Days Vs Air Quality
Longmont, Colorado, United States
97%
218
3%
7
Total number of days with different AQI categories in last 229 days in 2026 (136 days remaining)
Under WHO’s Safe Air Quality Limits: 97%
Health Risk Level:
Very Low
In 2026, 97% of 229 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
Longmont, Colorado, United States
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
29AQI (US)
26AQI (US)
30AQI (US)
19AQI (US)
26AQI (US)
20AQI (US)
32AQI (US)
21AQI (US)
17AQI (US)
19AQI (US)
31AQI (US)
47AQI (US)
26AQI (US)
17AQI (US)
25AQI (US)
30AQI (US)
18AQI (US)
18AQI (US)
23AQI (US)
52AQI (US)
23AQI (US)
31AQI (US)
26AQI (US)
31AQI (US)
25AQI (US)
20AQI (US)
20AQI (US)
34AQI (US)
35AQI (US)
40AQI (US)
26AQI (US)
26AQI (US)
36AQI (US)
30AQI (US)
25AQI (US)
35AQI (US)
32AQI (US)
31AQI (US)
24AQI (US)
32AQI (US)
25AQI (US)
28AQI (US)
31AQI (US)
27AQI (US)
27AQI (US)
20AQI (US)
28AQI (US)
32AQI (US)
21AQI (US)
24AQI (US)
20AQI (US)
19AQI (US)
23AQI (US)
29AQI (US)
29AQI (US)
29AQI (US)
20AQI (US)
20AQI (US)
18AQI (US)
24AQI (US)
36AQI (US)
20AQI (US)
20AQI (US)
23AQI (US)
28AQI (US)
20AQI (US)
18AQI (US)
22AQI (US)
22AQI (US)
19AQI (US)
25AQI (US)
26AQI (US)
24AQI (US)
22AQI (US)
22AQI (US)
20AQI (US)
23AQI (US)
24AQI (US)
28AQI (US)
20AQI (US)
24AQI (US)
26AQI (US)
24AQI (US)
28AQI (US)
42AQI (US)
24AQI (US)
26AQI (US)
22AQI (US)
28AQI (US)
32AQI (US)
33AQI (US)
21AQI (US)
28AQI (US)
16AQI (US)
20AQI (US)
24AQI (US)
29AQI (US)
32AQI (US)
26AQI (US)
34AQI (US)
24AQI (US)
16AQI (US)
19AQI (US)
20AQI (US)
21AQI (US)
21AQI (US)
20AQI (US)
18AQI (US)
26AQI (US)
25AQI (US)
31AQI (US)
23AQI (US)
20AQI (US)
18AQI (US)
15AQI (US)
20AQI (US)
15AQI (US)
16AQI (US)
18AQI (US)
13AQI (US)
13AQI (US)
20AQI (US)
27AQI (US)
22AQI (US)
15AQI (US)
17AQI (US)
21AQI (US)
18AQI (US)
29AQI (US)
39AQI (US)
32AQI (US)
29AQI (US)
26AQI (US)
19AQI (US)
34AQI (US)
30AQI (US)
19AQI (US)
19AQI (US)
20AQI (US)
25AQI (US)
18AQI (US)
18AQI (US)
21AQI (US)
15AQI (US)
18AQI (US)
19AQI (US)
16AQI (US)
12AQI (US)
17AQI (US)
18AQI (US)
24AQI (US)
24AQI (US)
28AQI (US)
26AQI (US)
24AQI (US)
30AQI (US)
23AQI (US)
31AQI (US)
27AQI (US)
28AQI (US)
27AQI (US)
20AQI (US)
27AQI (US)
31AQI (US)
39AQI (US)
33AQI (US)
42AQI (US)
41AQI (US)
27AQI (US)
27AQI (US)
36AQI (US)
25AQI (US)
18AQI (US)
15AQI (US)
16AQI (US)
41AQI (US)
29AQI (US)
37AQI (US)
39AQI (US)
36AQI (US)
37AQI (US)
29AQI (US)
30AQI (US)
44AQI (US)
48AQI (US)
34AQI (US)
16AQI (US)
21AQI (US)
19AQI (US)
16AQI (US)
24AQI (US)
27AQI (US)
24AQI (US)
26AQI (US)
33AQI (US)
39AQI (US)
32AQI (US)
39AQI (US)
42AQI (US)
33AQI (US)
33AQI (US)
36AQI (US)
34AQI (US)
31AQI (US)
28AQI (US)
36AQI (US)
40AQI (US)
32AQI (US)
33AQI (US)
39AQI (US)
34AQI (US)
63AQI (US)
69AQI (US)
58AQI (US)
57AQI (US)
60AQI (US)
56AQI (US)
43AQI (US)
47AQI (US)
38AQI (US)
34AQI (US)
35AQI (US)
31AQI (US)
25AQI (US)
24AQI (US)
27AQI (US)
26AQI (US)
25AQI (US)
23AQI (US)
21AQI (US)
28AQI (US)
32AQI (US)
45AQI (US)
No. of days
202627AQI (US)
Highest AQI (US) recorded in
August45AQI (US)
Lowest AQI (US) recorded in
May21AQI (US)
202533AQI (US)
Highest AQI (US) recorded in
August45AQI (US)
Lowest AQI (US) recorded in
March22AQI (US)
202430AQI (US)
Highest AQI (US) recorded in
July44AQI (US)
Lowest AQI (US) recorded in
May20AQI (US)
202329AQI (US)
Highest AQI (US) recorded in
January44AQI (US)
Lowest AQI (US) recorded in
December19AQI (US)
202230AQI (US)
Highest AQI (US) recorded in
January45AQI (US)
Lowest AQI (US) recorded in
July23AQI (US)
202140AQI (US)
Highest AQI (US) recorded in
August71AQI (US)
Lowest AQI (US) recorded in
April29AQI (US)
202041AQI (US)
Highest AQI (US) recorded in
August61AQI (US)
Lowest AQI (US) recorded in
May23AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Longmont's annual 2026 AQI (US) (27) shows an average percentage change of -18.6% (improved AQI (US)) compared to previous years: 2020 (41), 2021 (40), 2022 (30), 2023 (29), 2024 (30), 2025 (33).