Evaluation of ambient air quality in Dehradun city during 2011–2014

Journal of earth system science

Purohit K D^1¹  Jaydeep Singh^4²  Hemwati Nandan^3³  Amar Deep^1⁴  Narendra Singh^4⁵  Chhavi P Pandey^2⁶ 

[1] Aryabhatta Research Institute of Observational Sciences, Manora Peak, Nainital 263 129, India.^4;Department of Physics, Graphic Era University, Dehradun 248 002, India.^6;Department of Physics, Gurukula Kangri Vishwavidyalaya, Haridwar 249 404, India.^3;Department of Physics, H N B Garhwal University, Srinagar, Garhwal 246 174, India.^1;Indian Institute of Tropical Meteorology, Prof Ramnath Vij Marg, New Delhi 110 060, India.^5;Wadia Institute of Himalayan Geology, Dehradun 248 001, India.^2

关键词: Air pollutants;    statistical analysis;    meteorological parameters;    air quality index;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

The variations in the ambient concentrations of particulate matter (SPM and PM$_{10}$) and gaseous pollutants (SO$_{2}$ and NO$_{2}$) at Clock tower (CT), Rajpur road (RR) and Inter State Bus Terminal (ISBT) station in Dehradun city, Uttarakhand, India are analysed for the period of 2011–2014. Mean concentrations are observed to be higher during pre-monsoon season as compared to the winter and monsoon. PM$_{10}$ and SPM concentrations with maximum values of 203 $\pm$ 23 and 429 $\pm$ 49 $\mu$g m$^{-3}$, respectively, during winter, are found to exceed the national standards by factors of 2 and 3. Winter-time elevated pollution in Dehradun is attributed to the lower ventilation coefficient (derived from Era interim model fields) and minimal precipitation. Nevertheless, the SO$_{2}$ and NO$_{2}$ levels are observed to be within the criteria notified by the Central Pollution Control Board (CPCB), India. Correlation analysis shows profound impacts of the meteorology and local dynamics on the observed variations in observed trace species. Additionally, the stronger inter-species correlation variations (r=0.79 for SO$_{2}$ with NO$_{2}$, and r=0.89 for PM$_{10}$ with SPM), which may suggest their origin from common sources. Analysis of ‘Air Quality Index (AQI)’ variations indicates unhealthy atmospheric conditions near the major city centers and bus station. More observations in the region are highly desirable to understand the dispersion of the enhanced pollution in the Dehradun valley.

【 授权许可】

CC BY