National Acid Precipitation Assessment Program NAPAP

The first major U.S. effort to deal with acid precipitation dates to 1980, when Congress created the National Acid Precipitation Assessment Program (NAPAP). NAPAP s mandate was to carry out... 

The United States Environmental Protection agency (F.PA) is required by several Congressional and other mandates to assess the effectiveness of air pollution control efforts. These mandates include Title IX of the Clean Air Act Amendments (CAAA), the National Acid Precipitation Assessment Program (NAPAP). the Government Performance and Results... 

The topic of acid rain during the 1980s and early 1990s was one of controversy and of incomplete answers in terms of official policy and science—after an expenditure of many millions of dollars. In 1980. the National Acid Precipitation Assessment Program (NAPAP) was established and subsequently consumed thousands of scientific research hours and costly field investigations, including the use of numerous helicopter expeditions to northwestern mountain and lake areas of the United States and Canada. Thousands of hours of computer power were consumed. 

National Acid Precipitation Assessment Program (NAPAP). (1990). Acidic Deposition State of Science and Technology. Vol. I. Emissions, Atmospheric Processes, and Deposition. Government Printing Office, Washington, DC. 

This currently operating network extends from Alaska to Puerto Rico, and from Maine to American Samoa with 190 sampling sites. Many of the stations have been identified as National Trends Network (NTN) sites - the monitoring network of the National Acid Precipitation Assessment Program (NAPAP) (15). 

The deterioration of marble and limestone exposed both to anthropogenic acid deposition from the environment and to natural weathering is being assessed as one of the major activities of the Materials Effects Task Group of the National Acid Precipitation Assessment Program (NAPAP). There is much concern for the calcareous stone materials because of their widespread use as the exterior structure of commercial, institutional, and private buildings as well as in valued monuments and memorials. These calcium carbonate materials are especially sensitive to an acid environment. 

This research was conducted as part of the National Acid Precipitation Assessment Program (NAPAP) from which most of the data were obtained. The views expressed in this paper are those of the authors and do not necessarily reflect those of NAPAP or its supporting agencies. 

The research being performed to support the National Acid Precipitation Assessment Program (NAPAP) has also led to considerable progress with regard to the other problem areas mentioned above. Damage functions have been developed by analyzing experimental data which delineate the separate effects of dry deposition of SO2 from those of wet deposition of acidity (H ), not only for metals (3 but for paints (O and calcareous stones ( 5). The spatial variability of relative humidity and thus... 

Power generation facilities are evaluated within the Title IV requirements versus baselines established within the National Acid Precipitation Assessment Program (NAPAP) Emissions Inventory. Descriptions of source and unit types applicable under Title IV can be found at http //epa.gov/air/caa/caa402.txt. 

The term volatile organic compounds (VOCs) is used to denote the entire set of vapor-phase atmospheric organics excluding CO and CO2. VOCs are central to atmospheric chemistry from the urban to the global scale. Characterizing VOC emissions ideally requires not just total VOCs but the individual chemical compounds that constitute the entire mixture since the atmospheric behavior of individual species can vary enormously. The U.S. National Acid Precipitation Assessment Program (NAPAP) inventory of anthro-... 

Did the science matter The National Acid Precipitation Assessment Program (NAPAP) was, at the time, the biggest interagency research and assessment program that the federal government had organized to understand an environmental problem. Was that investment worth it ... 

The incorporation of atmospheric species into the aqueous layer may occur through either dry or wet deposition. In dry deposition there is no involvement of any precipitation, whereas wet deposition requires, e.g., rain, dew, fog, or snow for atmospheric pollutants to deposit. Indoors or in highly polluted areas close to emission sources, dry deposition is considered to be dominating but the relative importance of wet deposition may be difficult to establish because of the incidental nature of precipitation. Controlled field studies combined with extensive laboratory exposures have been undertaken within the National Acid Precipitation Assessment Program (NAPAP) to explore the relative contribution of wet and dry deposition to increased corrosion rates of a number of metals [45]. 

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