Emission Factors for Asphalt-Related Emissions in Roofing Manufacturing

摘要

The vast majority of all residential construction in the United States is roofed with asphalt shingles, and asphalt products are also used extensively for commercial roofing. These roofing products are made in roughly 100 manufacturing facilities, by processing about six million tons of asphalt per year. The Asphalt Roofing Manufacturing Association (ARMA) has developed emission factors for asphalt-related air emissions for all relevant processes in the manufacture of roofing asphalt and fiberglass based roofing products. These processes include asphalt blowing, asphalt storage, and the coating of fiberglass mat with filled asphalt. The emission factors are based on measurements in more than 20 facilities around the country. They replace old, very limited data currently available from the US EPA in their AP-42 document. In some cases, as with par-ticulate emissions from asphalt blowing, the new emission factors are much lower than the current AP-42 factors. In other cases, emissions not included in AP-42 are recognized to be significant, as with SO_x emissions from asphalt blowing. Both criteria and hazardous air pollutant (HAP) emissions are covered in this compilation. Roofing asphalt processes are shown to be a very minor contributor to polyaromatic hydrocarbon (PAH) emissions. These data have been submitted to the US EPA for their consideration, and the HAP data presented here constituted the basis for the EPA MACT rulemaking for this industry.