Abstract
Measurements of direct and diffuse solar radiation, surface temperature and vapor pressure, and atmospheric dust content were made at two localities on the outskirts of Phoenix, Arizona. On two days of light to moderate air pollution with different dust contents, but nearly identical amounts of precipitable water aloft, total transmittances of the atmosphere for the combined direct plus diffuse solar radiation were nearly identical, while ratios of diffuse to direct solar radiation were quite different. The utility of diffuse skylight measurements to provide a detailed characterization of light to moderate particulate air pollution episodes was thereby demonstrated.
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