District 21, Tehran, Tehran Province, 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
District 21, Tehran, Tehran Province, Iran
AQI Trends: Highest and Lowest
Same Day Analysis (19th September ):
On this day, AQI across the 1 years varied significantly: 2025 ranks 1st highest AQI at 72 of Moderate air quality on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 19th Sep - 20th Sep 2025
District 21, Tehran, Tehran Province, Iran
6 AM19th Sep 2025
7 PM
5 AM20th Sep 2025
71AQI
52AQI
86AQI
69AQI
In the last 24 hours,
District 21's AQI reached its highest point of 86 at 5 AM during the Night, while the lowest point, 52, was recorded at 9 AM during the Day between 19th Sep and 20th Sep 2025.
Day & Night AQI Trend : Aug - Sep 2025
District 21, Tehran, Tehran Province, Iran
31°C26/35°C
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
--°C/°C
79AQI
79AQI
79AQI
77AQI
2025 Days Vs Air Quality
District 21, Tehran, Tehran Province, Iran
80%
91
20%
23
Total number of days with different AQI categories in last 263 days in 2025 (102 days remaining)
Under WHO’s Safe Air Quality Limits: 0%
Health Risk Level:
Extreme
In 2025, 0% of 263 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
District 21, Tehran, Tehran Province, Iran
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
74AQI
78AQI
74AQI
73AQI
74AQI
68AQI
70AQI
69AQI
72AQI
74AQI
82AQI
75AQI
74AQI
80AQI
81AQI
85AQI
83AQI
79AQI
83AQI
88AQI
102AQI
106AQI
95AQI
96AQI
96AQI
97AQI
100AQI
100AQI
110AQI
103AQI
106AQI
111AQI
114AQI
116AQI
115AQI
113AQI
110AQI
111AQI
123AQI
116AQI
119AQI
103AQI
110AQI
120AQI
115AQI
110AQI
104AQI
94AQI
89AQI
86AQI
85AQI
83AQI
83AQI
84AQI
86AQI
84AQI
85AQI
78AQI
72AQI
69AQI
72AQI
80AQI
79AQI
84AQI
91AQI
89AQI
89AQI
91AQI
92AQI
89AQI
85AQI
84AQI
84AQI
82AQI
93AQI
89AQI
93AQI
84AQI
82AQI
88AQI
82AQI
87AQI
94AQI
93AQI
103AQI
91AQI
90AQI
103AQI
90AQI
85AQI
74AQI
78AQI
78AQI
74AQI
77AQI
66AQI
75AQI
75AQI
66AQI
80AQI
78AQI
78AQI
81AQI
79AQI
80AQI
80AQI
76AQI
75AQI
74AQI
71AQI
70AQI
70AQI
67AQI
72AQI
75AQI
88AQI
96AQI
87AQI
74AQI
No. of days
202587AQI
Highest AQI recorded in
July96AQI
Lowest AQI recorded in
September74AQI
Most & Least Polluted Years Over the Last 1 Years
District 21's annual 2025 AQI (87) shows an average percentage change of NaN% (improved AQI) compared to previous years: .