Houston, Chester, Illinois, 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
Houston, Chester, Illinois, United States
AQI Trends: Highest and Lowest
Same Day Analysis (14th August):
On this day, AQI across the 5 years varied significantly: 2026 ranks 2nd highest AQI at 47 of Good air quality, showing improvement over 2025 on the same day.
Day & Night AQI Trend: 14th Aug - 15th Aug 2026
Houston, Chester, Illinois, United States
6 AM14th Aug 2026
8 PM
5 AM15th Aug 2026
50AQI
42AQI
56AQI
42AQI
In the last 24 hours,
Houston's AQI reached its highest point of 56 at 12 AM during the Night, while the lowest point, 42, was recorded at 10 PM during the Night between 14th Aug and 15th Aug 2026.
Day & Night AQI Trend : Jul - Aug 2026
Houston, Chester, Illinois, United States
27°C23/33°C
29°C23/35°C
27°C25/32°C
28°C22/34°C
29°C24/36°C
23°C18/28°C
22°C17/27°C
22°C17/29°C
26°C20/34°C
30°C24/38°C
30°C24/37°C
30°C25/36°C
26°C19/32°C
26°C19/32°C
23°C21/30°C
22°C20/24°C
23°C21/28°C
24°C17/31°C
25°C19/32°C
25°C19/33°C
24°C22/28°C
26°C20/33°C
27°C22/32°C
27°C21/34°C
29°C24/36°C
29°C24/36°C
29°C25/37°C
29°C23/36°C
30°C25/36°C
32°C26/41°C
47AQI
46AQI
46AQI
45AQI
2026 Days Vs Air Quality
Houston, Chester, Illinois, United States
96%
215
4%
8
Total number of days with different AQI categories in last 227 days in 2026 (138 days remaining)
Under WHO’s Safe Air Quality Limits: 96%
Health Risk Level:
Very Low
In 2026, 96% of 227 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
Houston, Chester, Illinois, United States
AQI levels in 2026
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
40AQI (US)
50AQI (US)
36AQI (US)
46AQI (US)
46AQI (US)
41AQI (US)
39AQI (US)
40AQI (US)
20AQI (US)
22AQI (US)
15AQI (US)
23AQI (US)
38AQI (US)
11AQI (US)
15AQI (US)
22AQI (US)
12AQI (US)
16AQI (US)
14AQI (US)
31AQI (US)
41AQI (US)
43AQI (US)
54AQI (US)
28AQI (US)
32AQI (US)
36AQI (US)
27AQI (US)
31AQI (US)
44AQI (US)
54AQI (US)
30AQI (US)
36AQI (US)
46AQI (US)
39AQI (US)
35AQI (US)
49AQI (US)
40AQI (US)
30AQI (US)
24AQI (US)
47AQI (US)
40AQI (US)
29AQI (US)
51AQI (US)
38AQI (US)
44AQI (US)
30AQI (US)
36AQI (US)
36AQI (US)
42AQI (US)
41AQI (US)
28AQI (US)
24AQI (US)
23AQI (US)
27AQI (US)
44AQI (US)
45AQI (US)
36AQI (US)
41AQI (US)
32AQI (US)
28AQI (US)
38AQI (US)
30AQI (US)
37AQI (US)
27AQI (US)
21AQI (US)
30AQI (US)
32AQI (US)
34AQI (US)
30AQI (US)
33AQI (US)
24AQI (US)
31AQI (US)
25AQI (US)
26AQI (US)
27AQI (US)
29AQI (US)
23AQI (US)
51AQI (US)
50AQI (US)
41AQI (US)
42AQI (US)
32AQI (US)
31AQI (US)
49AQI (US)
49AQI (US)
27AQI (US)
17AQI (US)
20AQI (US)
39AQI (US)
36AQI (US)
25AQI (US)
21AQI (US)
21AQI (US)
29AQI (US)
28AQI (US)
29AQI (US)
26AQI (US)
45AQI (US)
39AQI (US)
32AQI (US)
28AQI (US)
34AQI (US)
26AQI (US)
33AQI (US)
29AQI (US)
21AQI (US)
21AQI (US)
20AQI (US)
19AQI (US)
23AQI (US)
40AQI (US)
21AQI (US)
16AQI (US)
23AQI (US)
22AQI (US)
20AQI (US)
20AQI (US)
27AQI (US)
20AQI (US)
19AQI (US)
25AQI (US)
37AQI (US)
33AQI (US)
22AQI (US)
24AQI (US)
27AQI (US)
24AQI (US)
22AQI (US)
31AQI (US)
43AQI (US)
27AQI (US)
44AQI (US)
48AQI (US)
53AQI (US)
50AQI (US)
50AQI (US)
45AQI (US)
39AQI (US)
38AQI (US)
48AQI (US)
39AQI (US)
38AQI (US)
33AQI (US)
21AQI (US)
37AQI (US)
38AQI (US)
27AQI (US)
23AQI (US)
23AQI (US)
26AQI (US)
36AQI (US)
43AQI (US)
36AQI (US)
22AQI (US)
26AQI (US)
20AQI (US)
21AQI (US)
26AQI (US)
20AQI (US)
17AQI (US)
19AQI (US)
16AQI (US)
17AQI (US)
18AQI (US)
38AQI (US)
20AQI (US)
21AQI (US)
20AQI (US)
18AQI (US)
16AQI (US)
17AQI (US)
28AQI (US)
17AQI (US)
16AQI (US)
20AQI (US)
29AQI (US)
34AQI (US)
58AQI (US)
47AQI (US)
37AQI (US)
23AQI (US)
23AQI (US)
26AQI (US)
23AQI (US)
23AQI (US)
33AQI (US)
31AQI (US)
28AQI (US)
21AQI (US)
18AQI (US)
28AQI (US)
30AQI (US)
36AQI (US)
28AQI (US)
41AQI (US)
44AQI (US)
46AQI (US)
84AQI (US)
49AQI (US)
43AQI (US)
40AQI (US)
35AQI (US)
47AQI (US)
47AQI (US)
47AQI (US)
51AQI (US)
42AQI (US)
43AQI (US)
45AQI (US)
41AQI (US)
39AQI (US)
46AQI (US)
46AQI (US)
48AQI (US)
39AQI (US)
45AQI (US)
44AQI (US)
47AQI (US)
48AQI (US)
43AQI (US)
46AQI (US)
48AQI (US)
47AQI (US)
32AQI (US)
37AQI (US)
33AQI (US)
26AQI (US)
34AQI (US)
25AQI (US)
37AQI (US)
45AQI (US)
No. of days
202633AQI (US)
Highest AQI (US) recorded in
August45AQI (US)
Lowest AQI (US) recorded in
June25AQI (US)
202537AQI (US)
Highest AQI (US) recorded in
June47AQI (US)
Lowest AQI (US) recorded in
January27AQI (US)
202431AQI (US)
Highest AQI (US) recorded in
October37AQI (US)
Lowest AQI (US) recorded in
November24AQI (US)
202338AQI (US)
Highest AQI (US) recorded in
June59AQI (US)
Lowest AQI (US) recorded in
December25AQI (US)
202236AQI (US)
Highest AQI (US) recorded in
June44AQI (US)
Lowest AQI (US) recorded in
September32AQI (US)
202138AQI (US)
Highest AQI (US) recorded in
July50AQI (US)
Lowest AQI (US) recorded in
October30AQI (US)
202040AQI (US)
Highest AQI (US) recorded in
June48AQI (US)
Lowest AQI (US) recorded in
May32AQI (US)
Most & Least Polluted Years Over the Last 7 Years
Houston's annual 2026 AQI (US) (33) shows an average percentage change of -9.4% (improved AQI (US)) compared to previous years: 2020 (40), 2021 (38), 2022 (36), 2023 (38), 2024 (31), 2025 (37).