期刊
ATMOSPHERIC ENVIRONMENT
卷 45, 期 35, 页码 6359-6367出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2011.08.044
关键词
Exhaust; Infiltration; Penetration ratio; Barcelona; Spain; Shift analysis
资金
- Spanish Ministry of the Environment and Rural and Marine Affairs [010/PC08/3-04.1]
- Spanish Ministry of Science and Innovation [GRACCIE CSD2007-00067, DAURE CGL2007-30502-E/CLI, VAMOS CGL2010_19464_CLI]
- Ramon y Cajal Programme
Ambient air emissions of sub-micron particles infiltrate into indoor environments and play a major role in indoor air quality. Discriminating between particles of indoor vs. outdoor origin is therefore essential when assessing indoor air pollutant levels and characteristics. Outdoor/indoor relationships of traffic-derived nanoscaled particulates (PM1 and black carbon) were determined in a typical Mediterranean environment. Results evidenced the major impact of outdoor vehicular traffic emissions on indoor particulates: despite windows remaining closed at all times, 70% of indoor BC and 73% of indoor PM1 originated from outdoor emissions. This was probably due to due to inadequate insulation of the building. Outdoor/indoor penetration ratios were relatively constant for BC (1.29 +/- 0.08) but not for PM1 (1.95 +/- 0.38), suggesting it is advisable to monitor the variability of penetration factors over time. Particle infiltration seemed to depend not only on physical barriers (building envelope, ventilation systems, etc.), but also on the physico-chemical properties of the particulates. Printing and photocopying contributed with 25-30% (546 ng m(-3)) of total indoor BC. Dust re-suspension by worker passage was the main indoor source of PM1 (15-20%, 1.1 mu g m(-3)). (C) 2011 Elsevier Ltd. All rights reserved.
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