Welby, Colorado, United States Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
July Air Quality Analysis
Welby, Colorado, United States
AQI Trends: Highest and Lowest
Same Day Analysis (31st July ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 4th highest AQI at 53 of Moderate air quality, showing improvement over 2024, 2023 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report
2025 Days Vs Air Quality
Welby, Colorado, United States
94%
199
6%
13
Total number of days with different AQI categories in last 213 days in 2025 (152 days remaining)
Under WHO’s Safe Air Quality Limits: 94%
Health Risk Level:
Very Low
In 2025, 94% of 213 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
Welby, Colorado, United States
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
40AQI
39AQI
52AQI
43AQI
30AQI
46AQI
37AQI
47AQI
35AQI
35AQI
23AQI
25AQI
27AQI
27AQI
39AQI
55AQI
49AQI
20AQI
32AQI
27AQI
30AQI
24AQI
30AQI
28AQI
23AQI
40AQI
61AQI
57AQI
52AQI
41AQI
39AQI
28AQI
25AQI
27AQI
49AQI
54AQI
24AQI
42AQI
28AQI
25AQI
27AQI
36AQI
34AQI
49AQI
56AQI
37AQI
46AQI
44AQI
34AQI
33AQI
46AQI
34AQI
33AQI
20AQI
18AQI
21AQI
18AQI
23AQI
29AQI
26AQI
25AQI
31AQI
23AQI
17AQI
23AQI
17AQI
27AQI
23AQI
26AQI
28AQI
25AQI
32AQI
30AQI
21AQI
20AQI
29AQI
36AQI
18AQI
24AQI
21AQI
22AQI
17AQI
27AQI
22AQI
30AQI
38AQI
35AQI
20AQI
22AQI
41AQI
29AQI
18AQI
21AQI
22AQI
26AQI
26AQI
30AQI
36AQI
41AQI
45AQI
47AQI
36AQI
26AQI
18AQI
35AQI
33AQI
34AQI
12AQI
21AQI
24AQI
20AQI
24AQI
32AQI
53AQI
24AQI
25AQI
33AQI
18AQI
20AQI
22AQI
16AQI
21AQI
24AQI
24AQI
22AQI
18AQI
21AQI
31AQI
30AQI
30AQI
24AQI
28AQI
37AQI
38AQI
16AQI
17AQI
18AQI
30AQI
14AQI
17AQI
19AQI
27AQI
31AQI
40AQI
16AQI
18AQI
31AQI
22AQI
19AQI
25AQI
27AQI
29AQI
25AQI
18AQI
32AQI
35AQI
27AQI
23AQI
30AQI
51AQI
44AQI
30AQI
31AQI
31AQI
33AQI
28AQI
33AQI
30AQI
28AQI
32AQI
36AQI
38AQI
38AQI
37AQI
46AQI
38AQI
31AQI
32AQI
37AQI
36AQI
32AQI
35AQI
32AQI
29AQI
26AQI
42AQI
31AQI
30AQI
34AQI
36AQI
38AQI
40AQI
57AQI
51AQI
40AQI
37AQI
42AQI
48AQI
51AQI
50AQI
39AQI
34AQI
32AQI
27AQI
30AQI
34AQI
40AQI
32AQI
36AQI
46AQI
42AQI
53AQI
37AQI
34AQI
26AQI
28AQI
24AQI
33AQI
39AQI
No. of days
202531AQI
Highest AQI recorded in
July39AQI
Lowest AQI recorded in
May24AQI
202456AQI
Highest AQI recorded in
June70AQI
Lowest AQI recorded in
November28AQI
202366AQI
Highest AQI recorded in
July70AQI
Lowest AQI recorded in
December40AQI
202270AQI
Highest AQI recorded in
April73AQI
Lowest AQI recorded in
November68AQI
202154AQI
Highest AQI recorded in
June71AQI
Lowest AQI recorded in
February22AQI
202040AQI
Highest AQI recorded in
August57AQI
Lowest AQI recorded in
December25AQI
Most & Least Polluted Years Over the Last 6 Years
Welby's annual 2025 AQI (31) shows an average percentage change of -42.7% (improved AQI) compared to previous years: 2020 (40), 2021 (54), 2022 (70), 2023 (66), 2024 (56).
