Ragweed pollen generation and sampling methods for filtration studies

The means of generating and measuring the concentration of ragweed pollen particles for air filtration studies is discussed. The development of an inexpensive in-line impaction type sampler which collects the sample on filter paper is described. The advantages of the total particle count method when using this sampler are also defined. The effect of sampling an air steam without using an isokinetic probe was investigated; a non isokinetic sampling train was found to give results with accuracy comparable to isokinetic data. Another part of the study was to examine the "shadowing" effect of one sampling probe. Means are given for adjusting data for this effect.