Johnstone, 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
Johnstone, Renfrewshire, United Kingdom
AQI Trends: Highest and Lowest
Same Day Analysis (24th September ):
On this day, AQI across the 4 years varied significantly: 2025 ranks 2nd highest AQI at 22 of Good air quality, showing improvement over 2024 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 25th Sep - 26th Sep 2025
Johnstone, Renfrewshire, United Kingdom
6 AM25th Sep 2025
7 PM
5 AM26th Sep 2025
39AQI
17AQI
45AQI
16AQI
In the last 24 hours,
Johnstone's AQI reached its highest point of 45 at 8 PM during the Night, while the lowest point, undefined, was recorded at 5 AM during the Night between 25th Sep and 26th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Johnstone, Renfrewshire, United Kingdom
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
8°C4/13°C
8°C4/14°C
9°C5/14°C
10°C5/15°C
--°C/°C
21AQI
18AQI
20AQI
18AQI
2025 Days Vs Air Quality
Johnstone, Renfrewshire, United Kingdom
94%
250
6%
17
Total number of days with different AQI categories in last 269 days in 2025 (96 days remaining)
Under WHO’s Safe Air Quality Limits: 94%
Health Risk Level:
Very Low
In 2025, 94% of 269 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
Johnstone, Renfrewshire, United Kingdom
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
30AQI
26AQI
28AQI
38AQI
34AQI
20AQI
21AQI
30AQI
34AQI
48AQI
60AQI
58AQI
31AQI
28AQI
26AQI
31AQI
31AQI
37AQI
44AQI
42AQI
32AQI
43AQI
33AQI
33AQI
24AQI
21AQI
21AQI
20AQI
22AQI
22AQI
23AQI
29AQI
25AQI
23AQI
21AQI
21AQI
26AQI
29AQI
27AQI
38AQI
33AQI
36AQI
35AQI
29AQI
35AQI
43AQI
42AQI
57AQI
53AQI
68AQI
32AQI
27AQI
27AQI
23AQI
29AQI
20AQI
22AQI
25AQI
26AQI
29AQI
28AQI
25AQI
25AQI
30AQI
45AQI
36AQI
51AQI
67AQI
47AQI
26AQI
22AQI
26AQI
29AQI
32AQI
26AQI
21AQI
40AQI
62AQI
74AQI
82AQI
63AQI
58AQI
34AQI
25AQI
32AQI
26AQI
20AQI
27AQI
35AQI
32AQI
37AQI
35AQI
44AQI
42AQI
38AQI
32AQI
35AQI
48AQI
33AQI
38AQI
48AQI
53AQI
25AQI
16AQI
18AQI
15AQI
15AQI
16AQI
17AQI
17AQI
27AQI
18AQI
28AQI
35AQI
30AQI
43AQI
21AQI
29AQI
28AQI
40AQI
46AQI
24AQI
21AQI
15AQI
19AQI
20AQI
26AQI
25AQI
28AQI
35AQI
43AQI
44AQI
38AQI
29AQI
28AQI
30AQI
31AQI
25AQI
29AQI
35AQI
33AQI
26AQI
29AQI
21AQI
19AQI
26AQI
27AQI
17AQI
15AQI
20AQI
17AQI
18AQI
23AQI
28AQI
24AQI
23AQI
19AQI
18AQI
21AQI
70AQI
39AQI
35AQI
52AQI
37AQI
27AQI
21AQI
31AQI
38AQI
27AQI
25AQI
32AQI
35AQI
36AQI
20AQI
18AQI
16AQI
16AQI
17AQI
22AQI
26AQI
18AQI
16AQI
16AQI
16AQI
19AQI
16AQI
16AQI
18AQI
26AQI
17AQI
17AQI
19AQI
21AQI
20AQI
22AQI
21AQI
21AQI
23AQI
19AQI
19AQI
29AQI
24AQI
20AQI
49AQI
59AQI
51AQI
33AQI
31AQI
21AQI
20AQI
18AQI
19AQI
18AQI
19AQI
20AQI
22AQI
24AQI
27AQI
24AQI
24AQI
26AQI
25AQI
25AQI
26AQI
43AQI
44AQI
31AQI
35AQI
34AQI
29AQI
28AQI
19AQI
19AQI
18AQI
19AQI
24AQI
27AQI
23AQI
22AQI
20AQI
19AQI
18AQI
21AQI
21AQI
21AQI
20AQI
16AQI
20AQI
17AQI
21AQI
20AQI
19AQI
20AQI
19AQI
18AQI
16AQI
17AQI
17AQI
17AQI
18AQI
22AQI
20AQI
20AQI
16AQI
17AQI
16AQI
22AQI
32AQI
32AQI
38AQI
31AQI
27AQI
28AQI
24AQI
25AQI
19AQI
No. of days
202529AQI
Highest AQI recorded in
March38AQI
Lowest AQI recorded in
September19AQI
202428AQI
Highest AQI recorded in
May43AQI
Lowest AQI recorded in
July19AQI
202328AQI
Highest AQI recorded in
April37AQI
Lowest AQI recorded in
August21AQI
202226AQI
Highest AQI recorded in
March44AQI
Lowest AQI recorded in
February16AQI
202126AQI
Highest AQI recorded in
April31AQI
Lowest AQI recorded in
March17AQI
202023AQI
Highest AQI recorded in
April31AQI
Lowest AQI recorded in
December13AQI
Most & Least Polluted Years Over the Last 6 Years
Johnstone's annual 2025 AQI (29) shows an average percentage change of 8.5% (worsened AQI) compared to previous years: 2020 (23), 2021 (26), 2022 (26), 2023 (28), 2024 (28).