Atmospheric Sulfur Dioxide and Particulate Matter A Comparison of Methods of Measurements

A Design Basis for Lead Dioxide Cylinders

“…Rather than using a single absorption coefficient as a basis for comparison, it was decided to use two, encompassing the range indicated by Stalker et al 6 . It should be mentioned that the "Nashville-Thomas Autometer" curve which they included was purposely excluded in the selection of absorption coefficients for the present comparison, since that particular curve was known to have a large error resulting from gases other than sulfur dioxide.…”

The Relationship between “Soiling Index” and Suspended Particulate Matter Concentrations

“…1 The procedure consists of drawing air through a pre-weighed filter at a known flow rate for a measured time interval. The mass concentration of the particulates collected is equal to the accumulated weightdivided by the air volume sampled; this is usually expressed in units of micrograms per cubic meter (/xg/m 3 ). This measurement is complicated by the need to change the niters periodically and to weigh them before and after use.…”