Bernard D. Tebbens

Fate of Arenes Incorporated with Airborne Soot: Effect of Irradiation

The airborne carcinogens as contained on soot disappear slowly in the dark, probably due to the presence of oxidizing material coproduced and carried with the carcinogens on the soot particles. A much more rapid disappearance occurs during exposure to light, the rate being proportional to the intensity of the light. The amount disappearing under the influence of light is directly related to the surface area of the particle. The sequential degradation from carcinogen through intermediates to final stable compounds is discussed.

Investigating Air Quality in Istanbul

A small group of fifth-year engineering students in Istanbul Technical University gathered the first data on air quality and pollution in Istanbul, Turkey, as the final part of their curriculum leading to a Masters degree in Sanitary Engineering, Each taking a different part of the problem, five individuals developed preliminary information on fuel usage and trends, particle fallout, meteorology, particulate and sulfur dioxide concentrations. Actual monitoring was limited to about two months in the spring of 1968. Particulate contamination and fallout were overwhelmingly the problem. Frequent fresh winds prevented the severe pollution seen in Ankara. A change in fuel usage may maintain tolerable conditions in spite of rapidly increasing urbanization and industrialization.

Evaluation of the effects of heat radiation on man.

The results of experiments that investigate the effects of low levels of radiant heat on a human subject exposed to moderate ambient air temperature conditions are presented. By means of an electronic infrared photographing technique, changes in peripheral circulation have been evaluated by recording changes in the prominence of the superficial venous pattern of the chest. Also, a method for estimating heat radiation doses equivalent to increased ambient air temperature conditions is presented.

Quality control of work environments.

As concern for environment increases, the impetus to apply more sophisticated quality control techniques to the work place environment will develop. Control concepts which are presented in this paper are applicable in industrial hygiene practice to a wide variety of situations; the examples presented vary in scale from vapor control at a single process to control of ventilation for an integrated group of work sites.

Air Monitoring Reflects Air Pollution Control Activity

Air monitoring by the A.I.S.I. filter sampling device which both preceded and was concurrent with source control of particulates demonstrated air quality improvement over a ten-year period. A difference in improvement from that estimated by the pollution control agency resulted from difference in the measurement parameters.

Dynamics of vapor-air mixtures.

Abstract Although it is generally recognized that density differences affect the vertical movement of gases, the downward flow of heavier-than-air mixtures has received little experimental attention. On theoretical grounds, a very small density increase can produce downward flow. Experimentally, a density difference of 0.6% was sufficient to induce vertical gas flow in a pipe. From a series of observations it was found that the relationship of density to flow rate can be characterized, and that in unrestricted systems the maximum concentration of heavy vapor is far less than that predicted from vapor pressure data. This maximum is related not only to vapor pressure, evaporation rate, temperature, etc., but also to the fact of downflow and air induction associated with it.