Spatial variability of concentrations of gaseous pollutants across the National Capital Region of Delhi, India

Developmental Biology

D.S. Bisht¹  S.D. Attri²  A. Mishra³  Philip K. Hopke⁴  S. Tiwari¹  S. Tyagi³  A.K. Srivastava¹ 

[1] Indian Institute of Tropical Meteorology, New Delhi Branch, 110060, India$$;India Meteorological Department, Lodi Road, New Delhi 110003, India$$;Department of Environmental Science, School of Vocational Studies and Applied Sciences, Gautam Buddha University, Greater Noida, UP 201303, India$$;Clarkson University, Box 5708, Potsdam, NY 13699-5708, USA$$

关键词: Oxides of nitrogen;    Carbon monoxide;    Ozone;    Air quality monitoring stations;    Resultant wind vector;   

DOI  :  10.1016/j.apr.2016.04.008

学科分类：农业科学（综合）

来源: Dokuz Eylul Universitesi * Department of Environmental Engineering

【 摘 要 】

This study presents a systematic evaluation of a year-long, continuous, real-time measurements of gaseous pollutants including oxides of nitrogen (NO_x = NO + NO₂), carbon monoxide (CO), and ozone (O₃) in the National Capital Region (NCR) of Delhi. Data are available from seven air quality monitoring stations (AMS) and meteorological parameters were measured at three meteorological observatories (MO). The daily mean concentrations of NO_x and CO across NCR of Delhi (average of all seven AMSs) were 37.1 ± 11.6 ppb (NO: 18.3 and NO₂: 18.8 ppb), and 2.3 ± 0.6 ppm, respectively. The highest diurnal CO concentrations were observed during midnight (21:00 to 01:00 h LT) due to nocturnal boundary conditions. The daily mean O₃ concentration was 37.5 ± 11.0 ppb. The diurnal variations of O₃ concentrations were characterized by the high concentrations during the daytime (07:00 to 17:00 h LT: 43.6 ppb) and low concentrations during the late evening and early morning hours (18:00 to 06:00 h LT: 31.1 ppb). From 07:00 h onwards, the O₃ concentrations start increasing gradually after sunrise coinciding with the increasing solar radiation. The highest concentrations (51.7 ppb) were observed around 15:00 h. Thereafter, it is decreased. Local sources of gaseous pollutants were identified by analyzing the surface wind patterns. The annual resultant wind vector were 338° (57%) and 288° (27%) at the Hindon and Palam MOs, respectively. Local NO emissions substantially reduced the urban ozone concentrations as seen by the observed untitrated NO concentrations.

【 授权许可】

Unknown   

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