Research is ongoing in the area of data quality in airborne particulate matter measurements. See references below for recently published work.
Hyslop, N.P. and White, W.H., 2008a. An evaluation of interagency monitoring of protected visual environments (IMPROVE) collocated precision and uncertainty estimates. Atmospheric Environment 42, 2691-2705.
Hyslop, N.P. and White, W.H., 2008b. An empirical approach to estimating detection limits using collocated data. Environmental Science & Technology 42(14), 5235-5240.
Hyslop, N.P. and White, W.H., 2009. Estimating precision using duplicate measurements. Journal of Air & Waste Management Association 59, 1032-1039.