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!
March Air Quality Analysis
Welby, Colorado, United States
AQI Trends: Highest and Lowest
Same Day Analysis (10th March):
On this day, AQI across the 5 years varied significantly: 2026 ranks 4th highest AQI at 31 of Good air quality, showing improvement over 2024, 2023 and 2022 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 9th Mar - 10th Mar 2026
Welby, Colorado, United States
6 AM9th Mar 2026
5 PM
5 AM10th Mar 2026
50AQI
20AQI
22AQI
8AQI
In the last 24 hours,
Welby's AQI reached its highest point of 50 at 10 AM during the Day, while the lowest point, 8, was recorded at 2 AM during the Night between 9th Mar and 10th Mar 2026.
Day & Night AQI Trend : Feb - Mar 2026
Welby, Colorado, United States
10°C3/22°C
5°C1/9°C
6°C-2/15°C
7°C2/13°C
7°C1/13°C
7°C2/14°C
9°C0/19°C
9°C2/18°C
9°C4/14°C
4°C-2/11°C
0°C-4/5°C
-5°C-8/-2°C
1°C-6/8°C
0°C-9/10°C
8°C-3/20°C
11°C3/21°C
12°C4/20°C
10°C3/18°C
11°C4/19°C
12°C5/22°C
11°C3/19°C
13°C5/20°C
6°C4/8°C
9°C1/18°C
10°C2/19°C
3°C0/4°C
4°C-3/12°C
9°C1/18°C
12°C4/21°C
12°C4/21°C
45AQI
22AQI
32AQI
19AQI
2026 Days Vs Air Quality
Welby, Colorado, United States
100%
69
Total number of days with different AQI categories in last 70 days in 2026 (295 days remaining)
Under WHO’s Safe Air Quality Limits: 100%
Health Risk Level:
Very Low
In 2026, 100% of 70 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 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
22AQI (US)
23AQI (US)
32AQI (US)
16AQI (US)
42AQI (US)
19AQI (US)
43AQI (US)
18AQI (US)
25AQI (US)
22AQI (US)
18AQI (US)
28AQI (US)
25AQI (US)
21AQI (US)
28AQI (US)
28AQI (US)
14AQI (US)
15AQI (US)
19AQI (US)
27AQI (US)
26AQI (US)
32AQI (US)
26AQI (US)
31AQI (US)
23AQI (US)
20AQI (US)
23AQI (US)
39AQI (US)
38AQI (US)
38AQI (US)
26AQI (US)
24AQI (US)
48AQI (US)
38AQI (US)
28AQI (US)
38AQI (US)
31AQI (US)
32AQI (US)
21AQI (US)
30AQI (US)
25AQI (US)
39AQI (US)
37AQI (US)
36AQI (US)
24AQI (US)
24AQI (US)
36AQI (US)
39AQI (US)
21AQI (US)
27AQI (US)
21AQI (US)
20AQI (US)
22AQI (US)
40AQI (US)
38AQI (US)
33AQI (US)
20AQI (US)
28AQI (US)
19AQI (US)
24AQI (US)
35AQI (US)
25AQI (US)
21AQI (US)
31AQI (US)
29AQI (US)
24AQI (US)
24AQI (US)
22AQI (US)
31AQI (US)
26AQI (US)
30AQI (US)
27AQI (US)
No. of days
202628AQI (US)
Highest AQI (US) recorded in
February30AQI (US)
Lowest AQI (US) recorded in
January26AQI (US)
202535AQI (US)
Highest AQI (US) recorded in
October46AQI (US)
Lowest AQI (US) recorded in
May24AQI (US)
202456AQI (US)
Highest AQI (US) recorded in
June70AQI (US)
Lowest AQI (US) recorded in
November28AQI (US)
202366AQI (US)
Highest AQI (US) recorded in
July70AQI (US)
Lowest AQI (US) recorded in
December40AQI (US)
202270AQI (US)
Highest AQI (US) recorded in
April73AQI (US)
Lowest AQI (US) recorded in
November68AQI (US)
202154AQI (US)
Highest AQI (US) recorded in
June71AQI (US)
Lowest AQI (US) recorded in
February22AQI (US)
202040AQI (US)
Highest AQI (US) recorded in
August57AQI (US)
Lowest AQI (US) recorded in
December25AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Welby's annual 2026 AQI (US) (28) shows an average percentage change of -44.7% (improved AQI (US)) compared to previous years: 2020 (40), 2021 (54), 2022 (70), 2023 (66), 2024 (56), 2025 (35).