Conference Proceedings

Residential indoor and outdoor ultrafine particles in Windsor, Ontario

J Kearney, L Wallace, M MacNeill, X Xu, K VanRyswyk, H You, R Kulka, AJ Wheeler

ATMOSPHERIC ENVIRONMENT | PERGAMON-ELSEVIER SCIENCE LTD | Published : 2011

Abstract

UFPs in the 20-100 nm size range were measured for 10 mins every hour for 5 consecutive days in 45 homes of nonsmoking adults in summer 2005 and in 49 homes of asthmatic children in summer and winter 2006. Median hourly outdoor levels across all measurements were 10,800, 12,000 and 6300 cm-3 and median indoor levels were 2700, 3730 and 2580 cm-3 in summer 2005, winter 2006 and summer 2006, respectively. Outdoor levels generally exceeded indoor levels but indoor concentrations were higher around 5-7pm, suggesting a strong influence of cooking. Daily and weekly infiltration factors were estimated for each home using three methods. Weekly infiltration factors (Finf's) based on a censored indoor..

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