THE EFFECT OF NATIONAL EVENTS AND HOLIDAYS ON AMBIENT PM2.5 CONCENTRATIONS
Introduction: The aim of this study was to evaluate the effect of national events and holidays on PM2.5 concentrations in Tehran megacity. Materials and methods: Air quality data were collected from Tehran Air Quality Control Company (TAQCC) over a period of four years, 2012 – 2015, then data from 1...
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| Format: | Article |
| Language: | English |
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Tehran University of Medical Sciences
2018-08-01
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| Series: | Journal of Air Pollution and Health |
| Subjects: | |
| Online Access: | https://japh.tums.ac.ir/index.php/japh/article/view/163 |
| _version_ | 1818935903278596096 |
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| author | Ramin Nabizadeh Nodehi Seyed Yaser Hashemi Faramarz Azimi |
| author_facet | Ramin Nabizadeh Nodehi Seyed Yaser Hashemi Faramarz Azimi |
| author_sort | Ramin Nabizadeh Nodehi |
| collection | DOAJ |
| description | Introduction: The aim of this study was to evaluate the effect of national events and holidays on PM2.5 concentrations in Tehran megacity.
Materials and methods: Air quality data were collected from Tehran Air Quality Control Company (TAQCC) over a period of four years, 2012 – 2015, then data from 10 air quality monitoring stations were processed using R- 3.3.3. The Iranian New year, Ashura and Eid al - Fitr were the national events that considered to study. To compare the daily mean PM2.5 concentrations in Norooz holidays and other days of spring, the Mann - Whitney test and difference in PM2.5 concentrations in each season were investigated with Kruskal-Wallis test.
Results: In Norooz holidays, the daily mean PM2.5 concentrations in comparison with other spring days were decreased significantly (Pvalue < 0.001). The same decreasing occurred for 10 fi rst days of Muharram too (Pvalue < 0.01) but the daily PM2.5 concentrations during Ramadan days were signifi cantly higher than that of summer days (Pvalue < 0.001). Based on Kruskal-Wallis test the difference in PM2.5 concentrations between seasons was signifi cant and only between summer-autumn (Pvalue > 0.05) and winter-summer (Pvalue > 0.05) was not.
Conclusions: The effect of holidays on PM2.5 concentration was not observed in summer, however it was an effect in autumn. In addition the concentration of PM2.5 was not influenced by holidays in winter regarding the thermal inversion and stability of air. |
| first_indexed | 2024-12-20T05:27:34Z |
| format | Article |
| id | doaj.art-2a33708495444103adc3dad773347a58 |
| institution | Directory Open Access Journal |
| issn | 2476-3071 |
| language | English |
| last_indexed | 2024-12-20T05:27:34Z |
| publishDate | 2018-08-01 |
| publisher | Tehran University of Medical Sciences |
| record_format | Article |
| series | Journal of Air Pollution and Health |
| spelling | doaj.art-2a33708495444103adc3dad773347a582022-12-21T19:51:50ZengTehran University of Medical SciencesJournal of Air Pollution and Health2476-30712018-08-0132THE EFFECT OF NATIONAL EVENTS AND HOLIDAYS ON AMBIENT PM2.5 CONCENTRATIONSRamin Nabizadeh Nodehi0Seyed Yaser Hashemi1Faramarz Azimi2Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, IranDepartment of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, IranDepartment of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, IranIntroduction: The aim of this study was to evaluate the effect of national events and holidays on PM2.5 concentrations in Tehran megacity. Materials and methods: Air quality data were collected from Tehran Air Quality Control Company (TAQCC) over a period of four years, 2012 – 2015, then data from 10 air quality monitoring stations were processed using R- 3.3.3. The Iranian New year, Ashura and Eid al - Fitr were the national events that considered to study. To compare the daily mean PM2.5 concentrations in Norooz holidays and other days of spring, the Mann - Whitney test and difference in PM2.5 concentrations in each season were investigated with Kruskal-Wallis test. Results: In Norooz holidays, the daily mean PM2.5 concentrations in comparison with other spring days were decreased significantly (Pvalue < 0.001). The same decreasing occurred for 10 fi rst days of Muharram too (Pvalue < 0.01) but the daily PM2.5 concentrations during Ramadan days were signifi cantly higher than that of summer days (Pvalue < 0.001). Based on Kruskal-Wallis test the difference in PM2.5 concentrations between seasons was signifi cant and only between summer-autumn (Pvalue > 0.05) and winter-summer (Pvalue > 0.05) was not. Conclusions: The effect of holidays on PM2.5 concentration was not observed in summer, however it was an effect in autumn. In addition the concentration of PM2.5 was not influenced by holidays in winter regarding the thermal inversion and stability of air.https://japh.tums.ac.ir/index.php/japh/article/view/163NoroozPM2.5holidaysTehran |
| spellingShingle | Ramin Nabizadeh Nodehi Seyed Yaser Hashemi Faramarz Azimi THE EFFECT OF NATIONAL EVENTS AND HOLIDAYS ON AMBIENT PM2.5 CONCENTRATIONS Journal of Air Pollution and Health Norooz PM2.5 holidays Tehran |
| title | THE EFFECT OF NATIONAL EVENTS AND HOLIDAYS ON AMBIENT PM2.5 CONCENTRATIONS |
| title_full | THE EFFECT OF NATIONAL EVENTS AND HOLIDAYS ON AMBIENT PM2.5 CONCENTRATIONS |
| title_fullStr | THE EFFECT OF NATIONAL EVENTS AND HOLIDAYS ON AMBIENT PM2.5 CONCENTRATIONS |
| title_full_unstemmed | THE EFFECT OF NATIONAL EVENTS AND HOLIDAYS ON AMBIENT PM2.5 CONCENTRATIONS |
| title_short | THE EFFECT OF NATIONAL EVENTS AND HOLIDAYS ON AMBIENT PM2.5 CONCENTRATIONS |
| title_sort | effect of national events and holidays on ambient pm2 5 concentrations |
| topic | Norooz PM2.5 holidays Tehran |
| url | https://japh.tums.ac.ir/index.php/japh/article/view/163 |
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