Ultraviolet Extinction Measurements at the Chesapeake Bay

This report presents results of a previously unreported investigation of atmospheric attenuation in the ultraviolet region carried out in the spring of 1962 at the Chesapeake Bay Division of NRL. Measurements were made over a path 1/2 mile long in the spectral region 0.25 micrometers to 0.535 micrometers. The extinction measurements showed the ozone concentrations to be between 0.026 and 0.04 ppm. several observations showed the presence of pollutant gases which were assumed to be a mixture of SO sub 2 and NO sub 2. The presence of NO sub 2 seems to be necessary to account for the observed extinctions below 0.30 micrometers.