Abstract
The frequency distribution of total suspended particulate matter for Indianapolis, Ind., was examined in order to determine the precision associated with any given sampling scheme. By assuming a basic loge-normal distribution, a theoretical set of confidence intervals about the geometric mean was derived for random sampling. Verification of the loge-normal distribution was made for particulate matter in Indianapolis. Application of the derived confidence intervals revealed that for a 30-day period 20 samples must be taken to ensure that the 90% confidence interval will be within 10% of the geometric mean. Analysis of the records for 19 sampling locations within Indianapolis revealed that only 2 sites possessed sufficient data to allow monthly climatological evaluation over the period 1968-1970.