In addition, the benefits of avoided emissions of air pollutants have been estimated for agricultural production and the impact of acid precipitation on natural ecosystems. (ipcc.ch)
But the plan appears to be succeeding, according to a report released by the federal National Acid Precipitation Assessment Program (NAPAP). (sciencemag.org)
This network began in 1978 and expanded rapidly with funding from the National Acid Precipitation Assessment Program (NAPAP), established to improve understanding of the causes and effects of acidic precipitation. (climatechangenationalforum.org)