Air quality in Tehran

Air quality index (AQI) and PM2.5 air pollution in Tehran

Last update at (local time)

999.6K people follow this city

  • The profile image of follower
  • The profile image of follower
  • The profile image of follower
  • The profile image of follower
  • The profile image of follower
IQAir map with AQI colorful pins


Contributor profile image
* AQI modeled using satellite data Learn more

Tehran does not have air sensor data

Be the first to measure and contribute air quality data to your community

Find out more about contributors and data sources


What is the current weather in Tehran?

Weather icon
WeatherClear sky
Wind4.6 mp/h
Pressure30.2 Hg

live aqi city ranking

Real-time Iran city ranking

live Tehran aqi ranking

Real-time Tehran air quality ranking

#1 Air Quality App

Free iOS and Android air quality app

AirVisual App, Free iOS and Android air quality app



live AQI index

Human face indicating AQI level


What is the current air quality in Tehran?

Air pollution levelAir quality indexMain pollutant
Moderate 67* US AQItrendPM2.5



PM2.5 concentration in Tehran is currently 4 times the WHO annual air quality guideline value

Health Recommendations

How to protect from air pollution in Tehran?

An IQAir mask icon Sensitive groups should wear a mask outdoors
An IQAir purifier icon Sensitive groups should run an air purifier
An open window icon Close your windows to avoid dirty outdoor air
A man cycling icon Sensitive groups should reduce outdoor exercise


The latest air quality news and resources.


IQAir safeguards air quality at the 9/11 Museum Workshop


Get ready for World Clean Air Day


What is Swiss National Day?


Tehran air quality index (AQI) forecast

DayPollution levelWeatherTemperatureWind

Moderate 67 AQI US

Human face indicating AQI level
Weather icon
80.6° 68°
Wind rotating 174 degree 6.7 mp/h
Monday, Sep 25

Moderate 65 AQI US

Human face indicating AQI level
Weather icon
80.6° 69.8°
Wind rotating 145 degree 6.7 mp/h
Tuesday, Sep 26

Moderate 58 AQI US

Human face indicating AQI level
Weather icon
80.6° 69.8°
Wind rotating 186 degree 6.7 mp/h
Wednesday, Sep 27

Good 47 AQI US

Human face indicating AQI level
Weather icon
80.6° 69.8°
Wind rotating 171 degree 4.5 mp/h
Thursday, Sep 28

Moderate 58 AQI US

Human face indicating AQI level
Weather icon 30%
78.8° 68°
Wind rotating 205 degree 6.7 mp/h
Friday, Sep 29

Moderate 68 AQI US

Human face indicating AQI level
Weather icon
77° 68°
Wind rotating 148 degree 6.7 mp/h
Saturday, Sep 30

Moderate 61 AQI US

Human face indicating AQI level
Weather icon
78.8° 68°
Wind rotating 142 degree 6.7 mp/h

Interested in hourly forecast? Get the app


Historic air quality graph for Tehran

How to best protect from air pollution?

Reduce your air pollution exposure in Tehran


How bad are the air pollution levels in Tehran?

Tehran is the capital city of Iran. It has some 8.7 million inhabitants, making it one of the most populous cities in Iran as well as the whole of west Asia. The levels of pollution in Tehran are a topic of great importance for its citizens, with large quantities of smoke and dust filling Tehran each year, so much so to the point that the country is considering moving the capital to another location (with other attributable factors such as earthquakes also playing a part in this decision, which has yet to see any progress since its announcement in 2010).

There are a number of reasons for Tehran's pollution levels, with some lying in the industrial sector, vehicular sector as well as its geography, with the sizeable Alborz mountain range to the north of the city contributing to its pollution readings, due to allowing smoke and dust to accumulate and not disperse properly due to lack of wind being trapped in a ‘pollution sink’.

In 2019, Tehran came in with a PM2.5 reading of 25.9 μg/m³, putting it into the moderate pollution bracket. This rating requires a PM2.5 reading of anywhere between 12.1 to 35.4 μg/m³ to be classed as such. Despite the title, moderate levels of pollution can still be extremely harmful to its citizens or anyone who breathes it, whether it is on a long or short-term basis. Tehran frequently came in year-round with similar moderate readings, showing elevations in its pollution levels towards the end of the year, where numbers rose as high as 43.9 μg/m³ in November.

The 2019 average reading of 25.9 μg/m³ was enough to put Tehran into the 582nd place out of all polluted cities ranked worldwide, with the country of Iran itself actually coming in at 27th place out of all countries ranked worldwide. This shows that whilst Tehran certainly has its own pollution problems to deal with, there are other cities in the country that came in with worse year-round readings than the capital.

What are the main causes of pollution in Tehran?

The main causes of pollution in Tehran stem from a few sources, and are then compounded by its geographical location and topography, as well as meteorological conditions playing a role. A large amount of the pollution comes directly from vehicle usage, along with substandard and poor-quality fuels being used in them. Without delving too deeply into the geo-political reasons behind this, international sanctions have led to refineries in Iran being allowed to manufacture fuel that is of lesser quality that many international fuels would be.

With the fuel factor in mind, it is known that many of the cars that inhabit the roads are often old and fall well below what would acceptable for emission standards. This issue, coupled with the fuel one, and then added together with a large over-reliance on personal vehicles in the city has led to large amounts of smoke and haze being produced by the automobile industry. Lastly there are a large number of factories and industrial areas bordering Tehran's city limits, many of which would be running on fossil fuels for their heavy machinery, causing further elevations to the year-round ambient pollution levels.

Has pollution in Tehran gotten worse?

Looking back at the data taken over the last few years, it can be seen that pollution levels in Tehran have remained fairly consistent, all staying within the ‘moderate’ pollution rating bracket. However, gradual improvements have been made in the PM2.5 readings. PM2.5 refers to fine particulate matter of 2.5 micrometers (or less) in diameter. Due to its incredibly small size, it has a host of issues for those who respire it, and as such it is used as a major factor when calculating the overall level of air quality.

Observing the data, in 2017, Tehran came in with a PM2.5 reading of 34 μg/m³. This put it at the higher end of the moderate pollution bracket, and with an increase of only just 1.5 units it would move up into the higher bracket of ‘unhealthy for sensitive groups’, a rating that as the name implies would have a large number of negative effects on vulnerable portions of the population.

When is pollution in Tehran at its worst?

Once again looking at the data, it can be seen that pollution levels reach a peak towards the end of the year. This is when large amounts of smoke, haze and fumes would all be permeating the atmosphere, causing the elevated readings and being a noticeable concern for its citizens.

The cleanest month observed was April, with a PM2.5 reading of 13 μg/m³, making it only 1 unit away from moving down into the ‘good’ air quality bracket, which requires a reading of 10 to 12 μg/m³ to be classed as such.

This number however did not stay within that level for long, rising slowly till it reached its peak in November, although of note is that the months of June through to October, the pollution levels stayed very much at the same level, all hovering around the mid 20’s in terms of PM2.5 readings.

Whilst this is not a desirable number by any means, it is certainly more optimal than the end of the year, with November coming in at 43.9 μg/m³, and December at 41.1 μg/m³. These levels of pollution mean that those suffering from compromised immune systems, the young children or elderly, or those sensitive to chemical pollutants would find themselves at risk, and would find solace in preventative measures such as the wearing of particle filtering masks and avoiding outdoor activities whenever possible.

What are some health risks associated with breathing polluted air in Tehran?

Some of the health risks associated with breathing elevated levels of pollution, such as the ones seen at the end of the year (although with its year-round high readings these health risks would still be fairly prominent), would be ones mainly affecting the respiratory, cardiovascular and circulatory systems.

With large amounts of PM2.5 and PM10 coming from dust sources as well as emissions from fossil fuel-based vehicles and factories, damage to the lungs can occur in the form of lung tissue scarring, leading to a reduction in their full function as well as increased susceptibility to respiratory diseases such as pneumonia, bronchitis and asthma.

With larger particles on PM10 in the air, irritation to the eyes, nose, throat and skin can occur, along with increased risks of lung cancer. These are but a few of the health risks associated with breathing polluted air in Iran's capital city.

Where is the cleanest air quality in Tehran?

Your cart is empty

Connect With IQAir

Sign up for our newsletter