Factors Influencing Personal Exposure to Nitrogen Dioxide in an Indian Metropolitan Region

Abstract

This study was carried out in a mixed residential and industrial area of Mumbai. Nitrogen dioxide (NO2) concentrations were measured over 2-day periods both in winter (Feb. 1996) and summer (April 1996). Personal exposures as well as indoor and outdoor levels were monitored for 43 respondents. Personal exposures were found to vary substantially among the respondents, ranging from 10.2 to 87.5 ppb with a mean of 43.7 & p l u s m n ; 16 ppb in winter and 23.6 & p l u s m n ; 7.8 ppb in summer. Regression analysis of the data showed that there is a 37 and 47% correlation of personal exposure with indoor and outdoor concentration, respectively. ANOVA results showed that season of the year, house size and outdoor occupation significantly influenced the personal exposure to NO2 whereas it was not influenced by factors like type of fuel used and ambient air quality level. Personal exposure to NO 2 was significantly greater in winter than in summer. Respondents staying in smaller houses and/or having outdoor occupation were exposed to higher NO2 levels.

Source Apportionment of Human Exposure to Particulates in Mumbai, India

“…A study (Kulkarni, 2003) has linked the presence of potassium to the indoor residential microenvironment, which in turn influences personal exposure.…”

Assessment and Measurement of Atmospheric Pollution (Particulate Matter) Around Zawiya City-Libya

“…Total suspended particulate (TSP) in the ambient atmosphere can arise from a wide variety sources, forest fires, sea spry, volcanic emission, dust storms, soil and rock erosion, [10][11][12]. Natural sources, like dust, generally contribute aerosols of sizes>10 µm in diameter, while anthropogenic sources contribute <10 pm (classified under PM10 sized aerosols) [13].…”

Modeling the Occurrence of Nitrogen Oxides Indoors

“…In the present work, indoor NOx concentrations were measured in order to understand their contribution to indoor sources and so to human exposure. Kulkarni and Patil [1] carried out measurements of NO 2 in residential and industrial premises over 2-day periods both in winter and summer. Personal exposures were found to vary substantially among the 43 respondents, ranging from 10.2-87.5 ppb with a mean of 43.7 AE 16 ppb in winter and 23.6 AE 7.8 ppb in summer.…”