Chapter 7 Effects of Forest Fires on Visibility and Air Quality

摘要: Abstract The U.S. Clean Air Act establishes the goal of preventing future and remedying existing visibility impairment in 156 Class I areas (national parks, wilderness areas, wildlife refuges). A key element implementing this is Regional Haze Regulation (RHR). RHR based on relating impaired visibility, using metrics extinction (inverse megameters and/or “deciviews”), to concentration ambient particulate matter (PM), especially chemical components particulates smaller than 2.5 μm diameter, collectively known as PM 2.5 . itself also subject national air quality standards. Forest, rangeland, agricultural fires, both natural human caused emit primary secondary (formed atmosphere from gaseous organic carbon (OC) emissions) This chapter will review what we know about relationships between fire emissions, their fate atmosphere, contribution regional haze