Assessment of temporal and spatial variations of PM2.5 in Tehran during 2016-2017

Publish Year: 1396
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:

CANPM06_312

تاریخ نمایه سازی: 26 مرداد 1397

Abstract:

The adverse health impacts associated with air pollution have aroused concern in Tehran. In recent years, PM2.5 (particulate matter with an aerodynamic diameter less than 2.5 µm) has been recognized as the criteria pollutant in Tehran, since most of the days with unfavorable air quality conditions were due to its high levels. This research study aims to investigate the spatial and temporal variations of this critical air pollutant in Tehran. For such purposes, the mean hourly observational data measured at 20 stations between March 20, 2016 and March 20, 2017 were applied. An investigation of the seasonal variations in PM2.5 concentrations revealed the highest PM 2.5 concentrations were mostly observed in fall and winter, and a decrease in PM2.5 levels occurred in spring. Hourly mean PM2.5 concentrations in Tehran varied between 5 and 100 µg/m3 during the studied period. The diurnal variation of PM2.5 increased greatly from 6 to 9 a.m. and after 6 p.m., which is consistent with the rush hour time, while the concentration exhibited few variations in summer due to dust storms. In addition, the PM2.5 concentration decreased slightly on weekends compared to weekdays due to the reduction in the number of vehicles in use. Additionally, the variation in PM2.5 measured at a particular monitoring station was examined with respect to the wind direction. In the wintertime, a high concentration was mainly brought with westerly and southerly winds during the day, while its nighttime peak is observed when wind is from the northwest.

Keywords:

spatial and temporal variations , PM2.5 , data analysis

Authors

Hossein Shahbazi

PhD Candidate of Mechanical Engineering Department, Sharif University of Technology, Tehran

Sara Torbatian

Air Quality Control Company (AQCC), Tehran, Iran

Sajjad Karimi

Electrical Engineering Department, Sharif University of Technology, Tehran

Saman Gholipour

Electrical Engineering Department, Sharif University of Technology, Tehran