This assumption seems highly implausible and consequently estimates of above ground exposures appear to be particularly uncertain.
Vermeulen et al. (2010b) do not explicitly state how they estimated historical above ground exposures, but apparently they used the same assumption as for "intake air," i.e. the 1998 2001 estimated level was applied for all years.
Exposure assessment for this survey was based on modelled data for ground level exposure within the study area.
But even in diseases closely related to dust, making a binding connection to ground zero exposure is hard.
Other factors influence bat decision-making, too, such as the pitcher's distance from the ground, or exposure to rain and sunlight and the Schöners discovered then when possible, the bats did demonstrate a loyalty for resettling in different N. hemsleyana pitchers.
NIOSH/NCI assumed that estimates of above ground REC exposures were time-independent and assigned the exposures measured during 1998 2001 to all past years in which diesel equipment was used in a mine.
The ruse the article depicts is a CDO called Pyxis., which purportedly served as a dumping ground for exposures Merrill could not unload.
Additionally, during rapidly varying wind conditions such as in 2011, satellite measured AOD may not realistically represent ground level exposures.
