Renfrew, Renfrewshire, United Kingdom Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
September Air Quality Analysis
Renfrew, Renfrewshire, United Kingdom
AQI Trends: Highest and Lowest
Same Day Analysis (21st September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 3rd highest AQI at 16 of Good air quality, showing improvement over 2024 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 21st Sep - 22nd Sep 2025
Renfrew, Renfrewshire, United Kingdom
6 AM21st Sep 2025
7 PM
5 AM22nd Sep 2025
16AQI
12AQI
18AQI
14AQI
In the last 24 hours,
Renfrew's AQI reached its highest point of 18 at 5 AM during the Night, while the lowest point, 12, was recorded at 8 AM during the Day between 21st Sep and 22nd Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Renfrew, Renfrewshire, United Kingdom
14°C11/18°C
16°C13/20°C
17°C11/22°C
15°C11/18°C
13°C11/18°C
13°C11/15°C
13°C11/15°C
13°C12/16°C
14°C11/18°C
14°C12/16°C
13°C9/16°C
11°C9/13°C
12°C9/16°C
12°C9/15°C
14°C9/18°C
16°C12/19°C
12°C9/15°C
12°C8/15°C
13°C10/17°C
10°C8/12°C
10°C8/12°C
9°C7/11°C
9°C6/12°C
11°C8/14°C
11°C8/14°C
11°C8/13°C
12°C11/15°C
13°C8/15°C
10°C5/15°C
7°C4/12°C
--°C/°C
22AQI
19AQI
21AQI
20AQI
2025 Days Vs Air Quality
Renfrew, Renfrewshire, United Kingdom
95%
252
5%
12
Total number of days with different AQI categories in last 265 days in 2025 (100 days remaining)
Under WHO’s Safe Air Quality Limits: 95%
Health Risk Level:
Very Low
In 2025, 95% of 265 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
Renfrew, Renfrewshire, United Kingdom
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
23AQI
24AQI
27AQI
34AQI
32AQI
25AQI
24AQI
28AQI
32AQI
37AQI
46AQI
48AQI
36AQI
31AQI
28AQI
28AQI
27AQI
29AQI
35AQI
37AQI
37AQI
41AQI
37AQI
32AQI
27AQI
25AQI
23AQI
23AQI
22AQI
22AQI
28AQI
36AQI
29AQI
25AQI
22AQI
20AQI
23AQI
25AQI
27AQI
33AQI
34AQI
33AQI
32AQI
29AQI
30AQI
35AQI
37AQI
42AQI
44AQI
53AQI
43AQI
34AQI
29AQI
24AQI
23AQI
21AQI
22AQI
23AQI
26AQI
29AQI
30AQI
25AQI
24AQI
24AQI
30AQI
31AQI
41AQI
56AQI
54AQI
44AQI
36AQI
30AQI
26AQI
25AQI
23AQI
23AQI
28AQI
45AQI
55AQI
61AQI
61AQI
57AQI
50AQI
41AQI
36AQI
32AQI
26AQI
25AQI
28AQI
29AQI
31AQI
32AQI
33AQI
33AQI
32AQI
29AQI
32AQI
36AQI
39AQI
42AQI
54AQI
54AQI
26AQI
12AQI
14AQI
16AQI
12AQI
14AQI
16AQI
16AQI
27AQI
17AQI
23AQI
29AQI
26AQI
37AQI
19AQI
26AQI
29AQI
39AQI
44AQI
22AQI
19AQI
15AQI
19AQI
19AQI
22AQI
23AQI
26AQI
33AQI
35AQI
43AQI
36AQI
26AQI
26AQI
27AQI
27AQI
23AQI
28AQI
34AQI
33AQI
23AQI
25AQI
20AQI
18AQI
22AQI
21AQI
17AQI
16AQI
21AQI
17AQI
17AQI
21AQI
26AQI
25AQI
22AQI
19AQI
19AQI
20AQI
68AQI
41AQI
33AQI
46AQI
37AQI
29AQI
22AQI
29AQI
36AQI
29AQI
23AQI
29AQI
33AQI
33AQI
21AQI
18AQI
17AQI
15AQI
17AQI
19AQI
26AQI
19AQI
16AQI
17AQI
15AQI
19AQI
15AQI
15AQI
18AQI
27AQI
17AQI
18AQI
19AQI
22AQI
23AQI
23AQI
22AQI
21AQI
22AQI
19AQI
18AQI
29AQI
26AQI
21AQI
50AQI
60AQI
52AQI
33AQI
30AQI
21AQI
20AQI
17AQI
18AQI
18AQI
19AQI
20AQI
22AQI
24AQI
27AQI
25AQI
23AQI
25AQI
24AQI
25AQI
26AQI
44AQI
44AQI
32AQI
35AQI
33AQI
28AQI
27AQI
18AQI
18AQI
18AQI
19AQI
24AQI
27AQI
23AQI
22AQI
20AQI
20AQI
19AQI
22AQI
23AQI
22AQI
20AQI
18AQI
20AQI
17AQI
22AQI
20AQI
20AQI
19AQI
20AQI
19AQI
17AQI
18AQI
19AQI
17AQI
18AQI
22AQI
19AQI
20AQI
16AQI
31AQI
31AQI
36AQI
28AQI
25AQI
27AQI
24AQI
25AQI
19AQI
No. of days
202528AQI
Highest AQI recorded in
March36AQI
Lowest AQI recorded in
September19AQI
202421AQI
Highest AQI recorded in
November33AQI
Lowest AQI recorded in
April13AQI
202315AQI
Highest AQI recorded in
November25AQI
Lowest AQI recorded in
July13AQI
202215AQI
Highest AQI recorded in
December20AQI
Lowest AQI recorded in
August13AQI
202114AQI
Highest AQI recorded in
May24AQI
Lowest AQI recorded in
February0AQI
20207AQI
Highest AQI recorded in
May10AQI
Lowest AQI recorded in
October4AQI
Most & Least Polluted Years Over the Last 6 Years
Renfrew's annual 2025 AQI (28) shows an average percentage change of 114.8% (worsened AQI) compared to previous years: 2020 (7), 2021 (14), 2022 (15), 2023 (15), 2024 (21).