Trend analysis of observational PM10 concentrations in Shimla city, India. (November 2019)

• Record Type: Journal Article
• Authors: Ganguly, Rajiv; Sharma, Divyansh; Kumar, Prashant
• Is Part Of: Sustainable cities and society. Volume 51(2020)
• Publication Date: 2019-11
• Subjects: PM10 -- Exceedance factor -- Criteria pollutants -- Meteorological parameters -- Shimla; Sustainable urban development -- Periodicals; Sustainable buildings -- Periodicals; Urban ecology (Sociology) -- Periodicals; 307.76
• DOI: 10.1016/j.scs.2019.101719
• Languages: English
• ISSNs: 2210-6707

Abstract

Highlights: Trend analysis of PM10 over a period of 7 years study is conducted and presented. Annual averages did not show a clear trend and seasonal analysis displayed maximum concentrations during summer. Correlations of PM10 with other criteria pollutants were presented. Correlation of PM10 with relevant meteorological parameters were presented. Design and location of additional monitoring stations for Shimla city were determined. Abstract: The present study aims to evaluate the long-term trends of PM10 at two monitoring stations (an urban and a background station) in Shimla city, in India during the period 2011–2017. The highest daily mean concentrations were determined to be 176 μg/m 3 and 152 μg/m 3 respectively at the urban and the background monitoring locations. Similarly, the annual mean concentrations at the monitoring locations were determined to be 59 μg/m 3 and 45 μg/m 3 respectively for urban and background concentrations. Exceedance factors determined showed that at the urban monitoring location the ranges varied between 'moderate to high' while at the background monitoring station it remained at 'moderate' levels. Seasonal analysis study carried out revealed that higher concentrations were observed during summer in comparison to winter with the least concentrations occurring during the monsoon season. A regression analysis was carried out to test the interdependency of the PM10 with other pollutants and a positive correlation was observed between PM10 and NO2 and SO2 . Similarly, correlation of PM10 with meteorological parameters such as wind speed and temperature were found to be positive while for parameters like precipitation and relative humidity it was negative. The paper also presents a critical discussion on the outcomes of the trend analysis study. This includes design and location of additional monitoring sites to adequately represent the actual ambient air quality conditions in Himachal Pradesh.