Region, Tehran, Tehran, Iran 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
Region, Tehran, Tehran, Iran
AQI Trends: Highest and Lowest
Same Day Analysis (20th September ):
On this day, AQI across the 5 years varied significantly: 2025 ranks the most lowest AQI at 75 of Moderate air quality, showing improvement over 2024, 2023, 2022 and 2021 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 20th Sep - 21st Sep 2025
Region, Tehran, Tehran, Iran
6 AM20th Sep 2025
7 PM
5 AM21st Sep 2025
82AQI
62AQI
88AQI
74AQI
In the last 24 hours,
Region's AQI reached its highest point of 88 at 11 PM during the Night, while the lowest point, 62, was recorded at 11 AM during the Day between 20th Sep and 21st Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
Region, Tehran, Tehran, Iran
32°C28/35°C
31°C27/34°C
31°C27/35°C
31°C27/34°C
30°C26/32°C
31°C27/33°C
30°C25/33°C
29°C25/32°C
29°C26/32°C
29°C25/32°C
29°C25/33°C
28°C24/31°C
28°C23/31°C
30°C25/33°C
31°C27/33°C
30°C27/33°C
30°C27/33°C
30°C27/34°C
30°C27/34°C
32°C28/34°C
30°C28/32°C
27°C24/30°C
25°C22/28°C
25°C22/28°C
24°C22/27°C
24°C21/27°C
25°C22/29°C
25°C21/28°C
27°C22/31°C
25°C23/27°C
--°C/°C
82AQI
76AQI
79AQI
76AQI
2025 Days Vs Air Quality
Region, Tehran, Tehran, Iran
2%
4
76%
200
19%
51
3%
8
Total number of days with different AQI categories in last 264 days in 2025 (101 days remaining)
Under WHO’s Safe Air Quality Limits: 2%
Health Risk Level:
Extreme
In 2025, 2% of 264 days were within WHO’s safe air quality limits. The risk of health issues is Extreme, potentially causing respiratory problems, heart disease, skin issues, and stress, especially for children, the elderly, and those with pre-existing conditions.
Annual Air Quality Insights
Region, Tehran, Tehran, Iran
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
128AQI
124AQI
101AQI
110AQI
101AQI
146AQI
150AQI
112AQI
116AQI
157AQI
157AQI
161AQI
140AQI
145AQI
153AQI
150AQI
112AQI
89AQI
96AQI
100AQI
90AQI
127AQI
102AQI
93AQI
90AQI
109AQI
122AQI
88AQI
110AQI
140AQI
158AQI
152AQI
160AQI
154AQI
145AQI
135AQI
100AQI
82AQI
67AQI
61AQI
74AQI
118AQI
131AQI
122AQI
67AQI
64AQI
70AQI
65AQI
81AQI
82AQI
81AQI
63AQI
54AQI
51AQI
48AQI
47AQI
49AQI
50AQI
54AQI
63AQI
58AQI
58AQI
53AQI
75AQI
62AQI
74AQI
57AQI
67AQI
76AQI
66AQI
74AQI
100AQI
108AQI
115AQI
132AQI
117AQI
136AQI
138AQI
125AQI
93AQI
67AQI
73AQI
81AQI
62AQI
76AQI
76AQI
86AQI
80AQI
79AQI
79AQI
68AQI
86AQI
79AQI
75AQI
77AQI
65AQI
68AQI
87AQI
74AQI
70AQI
83AQI
83AQI
76AQI
81AQI
78AQI
82AQI
63AQI
71AQI
69AQI
70AQI
66AQI
67AQI
67AQI
75AQI
88AQI
99AQI
90AQI
79AQI
76AQI
92AQI
75AQI
73AQI
69AQI
74AQI
74AQI
76AQI
80AQI
81AQI
70AQI
72AQI
68AQI
66AQI
68AQI
86AQI
74AQI
72AQI
75AQI
91AQI
80AQI
82AQI
75AQI
110AQI
103AQI
73AQI
72AQI
72AQI
74AQI
75AQI
76AQI
78AQI
71AQI
71AQI
76AQI
68AQI
67AQI
68AQI
71AQI
75AQI
84AQI
80AQI
80AQI
86AQI
80AQI
89AQI
84AQI
81AQI
84AQI
87AQI
96AQI
103AQI
89AQI
94AQI
96AQI
97AQI
94AQI
97AQI
108AQI
100AQI
103AQI
112AQI
109AQI
109AQI
117AQI
106AQI
120AQI
102AQI
120AQI
116AQI
116AQI
105AQI
115AQI
113AQI
104AQI
100AQI
95AQI
85AQI
83AQI
83AQI
83AQI
84AQI
81AQI
86AQI
85AQI
82AQI
84AQI
78AQI
68AQI
70AQI
71AQI
77AQI
78AQI
85AQI
93AQI
91AQI
89AQI
92AQI
92AQI
91AQI
89AQI
82AQI
82AQI
81AQI
92AQI
87AQI
90AQI
83AQI
84AQI
92AQI
83AQI
89AQI
99AQI
94AQI
97AQI
95AQI
92AQI
103AQI
90AQI
87AQI
76AQI
79AQI
80AQI
73AQI
78AQI
67AQI
78AQI
77AQI
63AQI
80AQI
76AQI
79AQI
79AQI
77AQI
81AQI
82AQI
77AQI
78AQI
74AQI
73AQI
71AQI
70AQI
69AQI
69AQI
75AQI
122AQI
87AQI
84AQI
77AQI
77AQI
88AQI
94AQI
88AQI
75AQI
No. of days
202588AQI
Highest AQI recorded in
January122AQI
Lowest AQI recorded in
September75AQI
202494AQI
Highest AQI recorded in
December138AQI
Lowest AQI recorded in
July68AQI
2023112AQI
Highest AQI recorded in
January161AQI
Lowest AQI recorded in
April91AQI
2022121AQI
Highest AQI recorded in
December150AQI
Lowest AQI recorded in
August86AQI
2021105AQI
Highest AQI recorded in
December148AQI
Lowest AQI recorded in
May73AQI
202092AQI
Highest AQI recorded in
December123AQI
Lowest AQI recorded in
April51AQI
Most & Least Polluted Years Over the Last 6 Years
Region's annual 2025 AQI (88) shows an average percentage change of -14.7% (improved AQI) compared to previous years: 2020 (92), 2021 (105), 2022 (121), 2023 (112), 2024 (94).