Most studies, however, have been conducted in areas with high background levels of ambient air pollution, making it challenging to isolate an independent effect of traffic.
Culturable bioaerosol concentrations were typically below the limit of detection in upwind samples except for actinomycetes which are a significant component of the background microbiota of ambient air at this location.
In order to inform the development of reliability targets for structural fire design, the background of the ambient reliability targets is discussed.
Background: The effect of ambient air pollution on global variations and trends in asthma prevalence is unclear.
This allowed us to examine the impacts of local variations in traffic in the absence of significant levels of background ambient pollution.
Predicted exposures in this paper are compared as a function of background ambient sound levels, type of land use impacted, numbers of daytime and nighttime operations, and train pass-by maximum sound levels.
Our estimated pollutant exposures should be regarded as indicators of primary emissions from local vehicular traffic on top of background ambient levels [see Supplemental Material (doi 10.1289/ehp.0800334.S1)].
Tony Smoking Backwards, with a drizzle of ambient background music, dwells on the thick smoke going in and out, the young smoker's mannerisms, his indolence.
Regulatory authorities require estimates of ambient background concentrations (ABCs) of potentially harmful elements (PHEs) in topsoil; such data are currently not available in many countries.
Recent research by Ravi Mehta, Rui Zhu, and Amar Cheema in the Journal of Consumer Research shows that working in an environment with a moderate level of ambient background noise can enhance performance on creative tasks.
