The contribution of nonroad equipment to overall risk is substantially lower in the 1999 national-scale assessment than it was in 1996. Is this due to changes in methodology or real reductions?
There are a number of factors contributing to this reduction. These include several methodological changes: • For the 1996 national-scale assessment, EPA used the Integrated Risk Information System (IRIS) cancer potency estimate for formaldehyde, which is several orders of magnitude higher risk than the CIIT-based value used in the 1999 version of assessment. Learn more. • There were improvements in data and methods used to develop nonroad air toxic inventories since the 1996 assessment was conducted. These data changes result in large reductions in emissions for several key pollutants, but do not reflect real emission reductions. • There were improvements in how emissions were spatially allocated for several types of nonroad equipment. Some emissions were re-located in lower population areas, which results in lower population exposure estimates and lower risk estimates. In addition, EPA programs are reducing emissions from nonroad equipment. EPA estimates this reduction at about 13% b
Related Questions
- The contribution of nonroad equipment to overall risk is substantially lower in the 2002 national-scale assessment than it was in 1996. Is this due to changes in methodology or real reductions?
- WHAT CAN AN INMATE DO IF THE PAROLE BOARD WANTS HIM/HER IN A LOWER SECURITY BUT THE RISK ASSESSMENT SCORE IS TOO HIGH TO BE CLASSIFIED AS SUCH?
- Based on this national-scale assessment, can EPA determine which areas and/or populations are at greatest risk from air toxics?
