• Rashmi Yadav, Aditya Nagori, Aparna Mukherjee, Varinder Singh, Rakesh Lodha, Sushil Kumar Kabra, Geetika Yadav, Jitendra Kumar Saini, Kamal K Singhal, Kana Ram Jat, Karan Madan, Mohan P George, Kalaivani Mani, Parul Mrigpuri, Raj Kumar, Randeep Guleria, Ravindra Mohan Pandey, Rohit Sarin, and Rupinder Singh Dhaliwal.
• Department of Pediatrics, All India Institute of Medical Science, New Delhi, India.
• Indian J Med Res. 2022 Oct 1; 156 (4&5): 648658648-658.

Background & ObjectivesStudies assessing the spatial and temporal association of ambient air pollution with emergency room visits of patients having acute respiratory symptoms in Delhi are lacking. Therefore, the present study explored the relationship between spatio-temporal variation of particulate matter (PM)2.5 concentrations and air quality index (AQI) with emergency room (ER) visits of patients having acute respiratory symptoms in Delhi using the geographic information system (GIS) approach.MethodsThe daily number of ER visits of patients having acute respiratory symptoms (less than or equal to two weeks) was recorded from the ER of four hospitals of Delhi from March 2018 to February 2019. Daily outdoor PM2.5 concentrations and air quality index (AQI) were obtained from the Delhi Pollution Control Committee. Spatial distribution of patients with acute respiratory symptoms visiting ER, PM2.5 concentrations and AQI were mapped for three seasons of Delhi using ArcGIS software.ResultsOf the 70,594 patients screened from ER, 18,063 eligible patients were enrolled in the study. Winter days had poor AQI compared to moderate and satisfactory AQI during summer and monsoon days, respectively. None of the days reported good AQI (<50). During winters, an increase in acute respiratory ER visits of patients was associated with higher PM2.5 concentrations in the highly polluted northwest region of Delhi. In contrast, a lower number of acute respiratory ER visits of patients were seen from the 'moderately polluted' south-west region of Delhi with relatively lower PM2.5 concentrations.Interpretation & ConclusionsAcute respiratory ER visits of patients were related to regional PM2.5 concentrations and AQI that differed during the three seasons of Delhi. The present study provides support for identifying the hotspots and implementation of focused, intensive decentralized strategies to control ambient air pollution in worst-affected areas, in addition to the general city-wise strategies.

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