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Int J Environ Health Res

Title:		Spatio-temporal variations of indoor air quality in a university library
Author(s):		Sahu V; Gurjar BR;
Address:		"Department of Civil Engineering, Indian Institute of Technology, Roorkee, India"
Journal Title:		Int J Environ Health Res
Year:		2021
Volume:		20190923
Issue:		5
Page Number:		475 - 490
DOI:		10.1080/09603123.2019.1668916
ISSN/ISBN:		1369-1619 (Electronic) 0960-3123 (Linking)
Abstract:		"The present study aims to assess the air quality status in the central library of Indian Institute of Technology Roorkee, India. Pollutants concentrations (i.e. PM(10), PM(2.5), PM(1) and TVOC) and comfort parameters i.e. CO(2), temperature and relative humidity were monitored across all floors of the library. Air quality was found to vary significantly (P < 0.05) among the different floors of the library. The average concentration of PM(10), PM(2.5) and PM(1) was found to be highest at the first floor. On the other hand, the highest concentration of TVOC (51.7 +/- 30 ppb) and CO(2) (838.4 +/- 99 ppm) was observed at the ground floor. Pollutant concentration was higher in the morning hours. The indoor pollutants were found positively correlated with each other except relative humidity. Indoor to outdoor ratio for PM(1), TVOC and CO(2) was found to be greater than 1, which indicate a substantial contribution from indoor sources. Exceedance of WHO guidelines was observed for the daily average PM(2.5) concentration.Abbreviation: IAQ: indoor air quality; ASHRAE: American Society of Heating, Refrigerating, and Air-Conditioning Engineers; WHO: World Health Organization; PM: particulate matter; VOC: volatile organic carbon; CO(2): carbon dioxide; TVOC: Total volatile organic compound; RH: relative humidity; HVAC: heating ventilation and air-conditioning; PID: Photo Ionization Detector; PTFE: Polytetrafluoroethylene; NDIR: Non-dispersive infra-red"
Keywords:		"Air Pollutants/*analysis Air Pollution, Indoor/analysis/*statistics & numerical data Environmental Monitoring Humans India *Libraries Particulate Matter/*analysis Spatio-Temporal Analysis Universities Volatile Organic Compounds/*analysis Indoor environmen;"
Notes:		"MedlineSahu, Veerendra Gurjar, Bhola Ram eng England 2019/09/25 Int J Environ Health Res. 2021 Jul; 31(5):475-490. doi: 10.1080/09603123.2019.1668916. Epub 2019 Sep 23"