Evaluation of 5 Air Criteria Pollutants; Tehran, Iran

Document Type : Original Article


Environmental Health Department, Health Faculty, Kashan University of Medical Sciences, Kashan, Iran


Aims Tehran’s uncontrolled expansion, which promoted housing, public utilities, industries
and increase of vehicles caused the problem of air pollution. Necessary information about air
quality in different places and different times is the first step of combating the air pollution.
The purpose of this study was to investigate the annual, monthly and hourly average of 5
criteria air pollutants (PM10, O3, NO2, SO2, CO) of Tehran City, Iran.
Instrument & Methods The hourly concentrations of PM10, O3, NO2, SO2, CO were obtained
from 21 air quality-measuring stations of Tehran City, Iran, during April 2012 to March 2013.
Data were presented by descriptive statistics in the form of mean and standard deviation.
Findings CO concentration was not changed during the period of study. Nitrogen dioxide
increased in spring and winter. Sulfur dioxide was not changed in the first six months of
the year but its concentration increased in winter. Trend of changes of floating particles
showed increasing the concentration of this pollutant in May 2012 and January 2013. Ozone
concentration increased in the warm seasons and decreased in the cold seasons.
Conclusion PM10, O3, NO2, SO2 and CO has high concentrations and cold periods of the year
are more polluted than the warm periods in Tehran City, Iran.