Porto Alegre, Rio Grande do Sul, Brazil 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
Porto Alegre, Rio Grande do Sul, Brazil
AQI Trends: Highest and Lowest
Same Day Analysis (27th September ):
On this day, AQI across the 3 years varied significantly: 2025 ranks 1st highest AQI at 11 of Good air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 27th Sep - 28th Sep 2025
Porto Alegre, Rio Grande do Sul, Brazil
6 AM27th Sep 2025
6 PM
5 AM28th Sep 2025
9AQI
6AQI
24AQI
6AQI
In the last 24 hours,
Porto Alegre's AQI reached its highest point of 24 at 9 PM during the Night, while the lowest point, 6, was recorded at 3 AM during the Night between 27th Sep and 28th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Porto Alegre, Rio Grande do Sul, Brazil
19°C14/25°C
20°C15/27°C
20°C16/27°C
22°C17/28°C
23°C19/29°C
22°C19/26°C
14°C11/16°C
11°C9/13°C
12°C9/15°C
15°C10/20°C
16°C15/18°C
16°C13/20°C
16°C11/23°C
16°C12/22°C
15°C12/19°C
16°C11/22°C
18°C12/24°C
19°C16/23°C
19°C16/22°C
19°C16/25°C
20°C15/27°C
21°C18/26°C
22°C19/26°C
20°C19/23°C
15°C12/17°C
16°C11/21°C
16°C12/20°C
15°C11/20°C
16°C11/22°C
18°C12/26°C
--°C/°C
42AQI
38AQI
44AQI
39AQI
2025 Days Vs Air Quality
Porto Alegre, Rio Grande do Sul, Brazil
70%
188
30%
82
Total number of days with different AQI categories in last 271 days in 2025 (94 days remaining)
Under WHO’s Safe Air Quality Limits: 70%
Health Risk Level:
Low
In 2025, 70% of 271 days were within WHO’s safe air quality limits. The risk of health issues is Low, but the long-term effects, especially on vulnerable individuals, remain uncertain.
Annual Air Quality Insights
Porto Alegre, Rio Grande do Sul, Brazil
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
46AQI
47AQI
45AQI
44AQI
45AQI
43AQI
45AQI
43AQI
42AQI
40AQI
41AQI
41AQI
41AQI
38AQI
41AQI
47AQI
48AQI
47AQI
50AQI
49AQI
46AQI
50AQI
41AQI
47AQI
53AQI
51AQI
47AQI
48AQI
48AQI
47AQI
45AQI
45AQI
48AQI
44AQI
46AQI
50AQI
50AQI
50AQI
48AQI
51AQI
48AQI
54AQI
60AQI
61AQI
56AQI
52AQI
55AQI
56AQI
56AQI
50AQI
50AQI
49AQI
50AQI
48AQI
47AQI
49AQI
50AQI
52AQI
51AQI
51AQI
45AQI
47AQI
50AQI
47AQI
46AQI
42AQI
48AQI
47AQI
48AQI
43AQI
47AQI
48AQI
45AQI
41AQI
43AQI
46AQI
49AQI
45AQI
44AQI
44AQI
44AQI
47AQI
47AQI
53AQI
55AQI
57AQI
58AQI
56AQI
57AQI
52AQI
57AQI
55AQI
53AQI
48AQI
45AQI
41AQI
39AQI
42AQI
49AQI
48AQI
40AQI
43AQI
46AQI
40AQI
38AQI
42AQI
45AQI
45AQI
45AQI
40AQI
40AQI
39AQI
38AQI
42AQI
39AQI
43AQI
48AQI
50AQI
43AQI
43AQI
36AQI
39AQI
44AQI
43AQI
46AQI
44AQI
46AQI
44AQI
37AQI
36AQI
28AQI
29AQI
29AQI
37AQI
46AQI
51AQI
48AQI
40AQI
35AQI
49AQI
41AQI
39AQI
31AQI
47AQI
43AQI
38AQI
38AQI
34AQI
33AQI
40AQI
45AQI
49AQI
48AQI
57AQI
47AQI
42AQI
32AQI
38AQI
48AQI
46AQI
46AQI
43AQI
36AQI
38AQI
44AQI
45AQI
39AQI
44AQI
48AQI
48AQI
47AQI
54AQI
52AQI
37AQI
37AQI
43AQI
53AQI
53AQI
55AQI
43AQI
37AQI
39AQI
50AQI
54AQI
55AQI
49AQI
47AQI
53AQI
54AQI
45AQI
47AQI
66AQI
54AQI
53AQI
54AQI
52AQI
67AQI
57AQI
40AQI
44AQI
58AQI
62AQI
56AQI
43AQI
35AQI
42AQI
48AQI
42AQI
35AQI
29AQI
41AQI
50AQI
55AQI
57AQI
70AQI
71AQI
68AQI
60AQI
50AQI
39AQI
33AQI
42AQI
54AQI
59AQI
61AQI
66AQI
56AQI
51AQI
52AQI
59AQI
57AQI
57AQI
60AQI
58AQI
58AQI
57AQI
53AQI
52AQI
53AQI
54AQI
49AQI
55AQI
60AQI
55AQI
52AQI
52AQI
44AQI
56AQI
52AQI
41AQI
40AQI
54AQI
48AQI
55AQI
68AQI
52AQI
54AQI
52AQI
50AQI
41AQI
30AQI
35AQI
42AQI
32AQI
21AQI
19AQI
22AQI
18AQI
16AQI
11AQI
45AQI
51AQI
48AQI
44AQI
40AQI
45AQI
49AQI
56AQI
41AQI
No. of days
202547AQI
Highest AQI recorded in
August56AQI
Lowest AQI recorded in
May40AQI
202436AQI
Highest AQI recorded in
July53AQI
Lowest AQI recorded in
February0AQI
202313AQI
Highest AQI recorded in
May29AQI
Lowest AQI recorded in
November6AQI
20226AQI
Highest AQI recorded in
October8AQI
Lowest AQI recorded in
November6AQI
Most & Least Polluted Years Over the Last 4 Years
Porto Alegre's annual 2025 AQI (47) shows an average percentage change of 318.8% (worsened AQI) compared to previous years: 2022 (6), 2023 (13), 2024 (36).