Table 8.1-2. Summary of Size Specific Emission Factors
Figure 8.1-4. Size specific emisssion factors for conventional asphalt plants.
Figure 8.1-11. Drum Mix Plants
Table 8.1-4. Emission Factors
Figure 8.1-5. Size Specifific Emission Factors
Figure 8.1-14. Emission Factors
Table 8.1-5. Emission Factors For Selected Gaseous Pollutants
Table 8.1-6. Characteristics of a Representative Asphaltic Concrete Plant
Figure 8.1-17. References for Section 8.1
Figure 8.1-18. References for Section 8.1
Any unconfined portion of the atmosphere: open air, surrounding air.
ATSDR uses comparison values to assist in selecting chemicals detected in environmental media for further evaluation. Comparison values are estimated contaminant concentrations that are not likely to cause adverse human health effects following exposure, given a standard intake rate and standard body weight. The comparison values are calculated from the scientific literature available on exposure and health effects. Because comparison values do not represent thresholds of toxicity, chemical concentrations exceeding comparison values do not necessarily pose health hazards.
The amount of one substance dissolved or contained in a given amount of another. For example, seawater contains a higher concentration of salt than fresh water.
Any substance or material that enters a system (the environment, human body, food, etc.) where it is not normally found.
The presence of hazardous substances in the environment. From the public health perspective, environmental contamination is addressed when it potentially affects the health and quality of life of people living and working near the contamination.
Contact with a chemical by swallowing, by breathing, or by direct contact (such as through the skin or eyes). Exposure may be short term (acute) or long term (chronic).
A response to a specific question or request for information pertaining to a hazardous substance or facility (which includes waste sites). It often contains a time-critical element that necessitates a rapid response; therefore, it is a more limited response than an assessment.
National Ambient Air Quality Standards
Standards established by EPA that apply for outdoor air throughout the country. National Emissions Standards for Hazardous Air Pollutants (NESHAPS): Emissions standards set by EPA for an air pollutant not covered by NAAQS that may cause an increase in fatalities or in serious, irreversible, or incapacitating illness. Primary standards are designed to protect human health, secondary standards to protect public welfare (e.g., building facades, visibility, crops, and domestic animals).
no apparent public health hazard
ATSDR places sites into one of five categories: 1) urgent public health hazard, 2) public health hazard, 3) indeterminate public health hazard, 4) no apparent public health hazard, 5) no public health hazard. These categories were selected to: 1) characterize the degree of public health hazard at the site based on factors such as the existence of potential pathways of human exposure, the susceptibility of the exposed community, the comparison of expected human exposure levels to applicable health-based standards, and an evaluation of existing community-specific health outcome data, 2) determine whether actions should be taken to reduce human exposure to hazardous substances from a site and whether additional information on human exposure and associated health risks is needed and should be acquired by conducting further environmental sampling or other health actions including epidemiologic studies, establishing a registry or a health surveillance program, or environmental health education, 3) identify toxicologic data gaps for substance-specific and generic toxicologic issues. These data gaps will be considered by the Division of Toxicology in establishing research priorities and in developing toxicological profiles.
The minimum odor of a water or air sample that can just be detected after successive dilutions with odorless water. Also called threshold odor.
Citizens and public officials may petition ATSDR to conduct a health assessment of hazardous waste site or a release of hazardous substances into the environment. Petitions for health assessments are submitted in writing to the ATSDR Assistant Administrator. After ATSDR receive the petition, evaluates the petition to determine what type of action best meets the community=s needs or if no action is needed. For more information about the petition process, please call the ATSDR toll-free information line at (800) 447-1544.
public health assessment
The evaluation of data and information on the release of hazardous substances into the environment in order to assess any current or future impact on public health, develop health advisories or other recommendations, and identify studies or actions needed to evaluate and mitigate or prevent human health effects; also, the document resulting from that evaluation.
Norms that impose limits on the amount of pollutants or emissions produced. EPA establishes minimum standards, but states are allowed to be stricter.
Acronyms and Abbreviations
The United States Environmental Protection Agency.
National Ambient Air Quality Standard
The Nebraska Department of
National Priorities List
particulate matter (10 micrometers and less)
parts per million