Temporal variations of ambient air pollutants and meteorological influences on their concentrations in Tehran during 2012–2017

We investigated temporal variations of ambient air pollutants and the influences of meteorological parameters on their concentrations using a robust method; convergent cross mapping; in Tehran (2012–2017). Tehran citizens were consistently exposed to annual PM 2.5 , PM 10 and NO 2 approximately 3.0–...

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Veröffentlicht in:Scientific reports 2020-01, Vol.10 (1), p.292, Article 292
Hauptverfasser: Yousefian, Fatemeh, Faridi, Sasan, Azimi, Faramarz, Aghaei, Mina, Shamsipour, Mansour, Yaghmaeian, Kamyar, Hassanvand, Mohammad Sadegh
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container_title Scientific reports
container_volume 10
creator Yousefian, Fatemeh
Faridi, Sasan
Azimi, Faramarz
Aghaei, Mina
Shamsipour, Mansour
Yaghmaeian, Kamyar
Hassanvand, Mohammad Sadegh
description We investigated temporal variations of ambient air pollutants and the influences of meteorological parameters on their concentrations using a robust method; convergent cross mapping; in Tehran (2012–2017). Tehran citizens were consistently exposed to annual PM 2.5 , PM 10 and NO 2 approximately 3.0–4.5, 3.5–4.5 and 1.5–2.5 times higher than the World Health Organization air quality guideline levels during the period. Except for O 3 , all air pollutants demonstrated the lowest and highest concentrations in summertime and wintertime, respectively. The highest O 3 concentrations were found on weekend (weekend effect), whereas other ambient air pollutants had statistically significant (P 
doi_str_mv 10.1038/s41598-019-56578-6
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Tehran citizens were consistently exposed to annual PM 2.5 , PM 10 and NO 2 approximately 3.0–4.5, 3.5–4.5 and 1.5–2.5 times higher than the World Health Organization air quality guideline levels during the period. Except for O 3 , all air pollutants demonstrated the lowest and highest concentrations in summertime and wintertime, respectively. The highest O 3 concentrations were found on weekend (weekend effect), whereas other ambient air pollutants had statistically significant (P &lt; 0.05) daily variations in which higher concentrations were observed on weekdays compared to weekend (holiday effect). Hourly O 3 concentration reached its peak at 3.00 p.m., though other air pollutants displayed two peaks; morning and late night. Approximately 45% to 65% of AQI values were in the subcategory of unhealthy for sensitive groups and PM 2.5 was the responsible air pollutant in Tehran. Amongst meteorological factors, temperature was the key influencing factor for PM 2.5 and PM 10 concentrations, while nebulosity and solar radiation exerted major influences on ambient SO 2 and O 3 concentrations. 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Tehran citizens were consistently exposed to annual PM 2.5 , PM 10 and NO 2 approximately 3.0–4.5, 3.5–4.5 and 1.5–2.5 times higher than the World Health Organization air quality guideline levels during the period. Except for O 3 , all air pollutants demonstrated the lowest and highest concentrations in summertime and wintertime, respectively. The highest O 3 concentrations were found on weekend (weekend effect), whereas other ambient air pollutants had statistically significant (P &lt; 0.05) daily variations in which higher concentrations were observed on weekdays compared to weekend (holiday effect). Hourly O 3 concentration reached its peak at 3.00 p.m., though other air pollutants displayed two peaks; morning and late night. Approximately 45% to 65% of AQI values were in the subcategory of unhealthy for sensitive groups and PM 2.5 was the responsible air pollutant in Tehran. 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convergent cross mapping; in Tehran (2012–2017). Tehran citizens were consistently exposed to annual PM 2.5 , PM 10 and NO 2 approximately 3.0–4.5, 3.5–4.5 and 1.5–2.5 times higher than the World Health Organization air quality guideline levels during the period. Except for O 3 , all air pollutants demonstrated the lowest and highest concentrations in summertime and wintertime, respectively. The highest O 3 concentrations were found on weekend (weekend effect), whereas other ambient air pollutants had statistically significant (P &lt; 0.05) daily variations in which higher concentrations were observed on weekdays compared to weekend (holiday effect). Hourly O 3 concentration reached its peak at 3.00 p.m., though other air pollutants displayed two peaks; morning and late night. Approximately 45% to 65% of AQI values were in the subcategory of unhealthy for sensitive groups and PM 2.5 was the responsible air pollutant in Tehran. Amongst meteorological factors, temperature was the key influencing factor for PM 2.5 and PM 10 concentrations, while nebulosity and solar radiation exerted major influences on ambient SO 2 and O 3 concentrations. Additionally, there is a moderate coupling between wind speed and NO 2 and CO concentrations.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>31941892</pmid><doi>10.1038/s41598-019-56578-6</doi><oa>free_for_read</oa></addata></record>
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subjects 704/106/35
Air pollution
Air Pollution - analysis
Air quality
Air temperature
Environmental Monitoring
Humanities and Social Sciences
Iran
multidisciplinary
Nitrogen dioxide
Nitrogen Dioxide - analysis
Ozone - analysis
Particulate matter
Particulate Matter - analysis
Pollutants
Science
Science (multidisciplinary)
Seasons
Solar radiation
Statistical analysis
Sulfur dioxide
Temperature
Temporal variations
Time Factors
Wind speed
title Temporal variations of ambient air pollutants and meteorological influences on their concentrations in Tehran during 2012–2017
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