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Letter of introduction for Dwight B. Heard on the arrival of National Park Service Director Stephen T. Mather to Phoenix. Mather's visit includes trips to Roosevelt Dam and Tumacácori.
Letter from Dwight B. Heard, president and publisher of The Arizona Republican, to Carl T. Hayden about a visit by Stephen Mather.
The purpose of the ambient air monitoring network is to sample air pollution in a variety of settings, assess the health and welfare effects, and assist in determining sources of air pollution. In general, six basic monitoring objectives and five measuring scales are used to determine the network design. Since it is physically and fiscally impossible to monitor the air in every location, representative samples must be obtained. These samples are determined by using the monitoring objectives and the spatial measurement scales. The network must be dynamic enough to maintain a current representative sample of the air quality. Air quality issues such as eight-hour ozone non-attainment boundaries and permits for new sources are diverse and controversial subjects for the citizens of Maricopa County. With its robust air monitoring network and mobile monitoring tools, the department strives to provide the most reliable and relevant air monitoring data to the public.
States are required to complete and submit to the U.S. Environmental Protection Agency an annual network monitoring plan. This plan informs the EPA of the monitoring activities ADEQ has implemented each year.
A five-year assessment of ADEQ's ambient air quality monitoring network, providing a broader view of topics than is found in the complementary annual network monitoring plans that ADEQ produces.
A five-year assessment of ADEQ's ambient air quality monitoring network, providing a broader view of topics than is found in the complementary annual network monitoring plans that ADEQ produces.