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Locations of recently published community epidemiology studies finding statistically significant associations between short-term concentrations of paniculate matter and health effects CD, Tables through Section b l defines a primary standard as one “the attainment and maintenance of which in the judgment of the Administrator, based on such criteria and allowing an adequate margin of safety, are requisite to protect the public health. The CD notes that the relative risk for respiratory-related mortality was up to 4. Appendix A outlines the policy considerations involved in making the staff recommendation for using 2. PM Concentrations and Trends a. Sensitive Subpopulations The recent epidemiologic information summarized in the CD provides evidence that several subgroups are apparently more sensitive susceptible to the effects of community air pollution containing PM.
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However, at least qualitative support for some of the epidemiologic observations has been reported for specific components of the ambient particle mix in controlled clinical studies of humans as well as studies in animals.
Fine mode PM is mainly composed of varying proportions of several major components: Indices of Morbidity Associated with Respiratory and Cardiovascular Disease Given the statistically significant positive associations between community PM concentrations and mortality outlined above, it is reasonable to anticipate that the same kinds of community-based observational studies should find increased morbidity with elevated levels of PM.
Table V-9 is a qualitative assessment of the short-term and long-term PM epidemiologic evidence with regard to subgroups that appear to be at greatest risk with respect to particular health endpoints.
v69aa The rate of mortality from pneumonia and influenza is relatively high for children under 1 year of age 11 times that for children 1 to 4 years, twice that of adults years of age CD, Table Alterations in clearance may also extend the time that particles or potentially harmful biogenic aerosols reside in the tracheobronchial region of the lung.
Sampling protocols may also affect the amount of semivolatile organics and nitrates and particle-bound water included in a measurement.
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The elderly may be more sensitive to respiratory insult from Kinstonne because such exposure may have effects on pulmonary and cardiovascular function which augment decreases seen with increasing age. Table V-3 presents a comparison of relative risk estimates reported for PM-related mortality expressed in terms of a PM10 increment. In general terms, one would expect that emission reductions of SO2 should lead to reductions in sulfate aerosol, but reductions will vary by season, depending on both emission fluctuations and changes in prevailing meteorology and photochemistry.
Thus, emphasis is placed on identifying those conclusions and uncertainties in the available scientific literature that the staff believes should be considered in selecting particulate pollutant indicators, forms, averaging times, and levels for the primary health and secondary welfare standards.
This latter figure illustrates that fine particles can be further subdivided into nuclei or ultrafme, and accumulation modes. These studies used more sophisticated statistical techniques to examine relationships between routine variations in PM and sulfur dioxide levels and mortality. The fundamental differences between fine and coarse kinsstone are also important considerations in assessing the available health effects and exposure information.
Number Page F-5a Sensitivity Analysis: Most PM10 sites sample on a once every six day schedule. Historical Findings from Community Epidemiology V-ll ii.
Infants in particular have been hypothesized to be a sensitive subpopulation for PM effects as exposure may increase the incidence or severity of acute respiratory infection including bronchitis, bronchiolitis, and pneumonia Samet et al. Taken together, the ACS study and the Six City study did not find any other statistically significant associations between PM levels and specific causes of mortality other than from cardiopulmonary causes.
Evidence of potential cancer risk from specific paniculate matter components comes from laboratory studies. Attention is drawn to judgments that must be made based on careful interpretation of incomplete or uncertain evidence.
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Thus, for both the prospective cohort and time series epidemiological studies, it appears reasonable to use a representative central monitor or spatially averaged group of monitors to represent the mean community exposure to outdoor PM.
Days to weeks s to s of kilometers Resuspension of industrial dust and soil tracked onto roads; Suspension from disturbed soil e. Changes in prostaglandins Schlesinger et kihstone b have also been observed in lung perfusate after exposure to H2SO4 and lavage.
In the northeastern states, winter minstone shows a 25 percent v96a while in the southeastern states, there is a 40 percent increase in winter haze NAPAP, Specific Causes of Mortality Associated with PM Table V-4 summarizes the relative risks for total mortality, respiratory and cardiovascular causes of death, and mortality among the elderly for the community studies evaluating cause of death.
Length of exposure increases kknstone cumulative lung burden dose equals concentration times time which may be related to susceptibility to particle effects. Two initial studies conducted in the Harvard six cities Ware et al.
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In locations where they are calibrated to standard mass units e. After CD, Figure Investigators began to use more sophisticated statistical techniques, originally based on econometric techniques, to further evaluate the association between short-term variations in PM and mortality CD, p The majority of such studies find effects associated with PM exposure to be linked to subpopulations with respiratory or cardiovascular disease CD, section Evaluation of the Epidemiological Evidence The majority of the evidence concerning health effects of PM exposure comes from epidemiological studies.
Some combustion-generated particles such as fly ash are also found in the coarse fraction. Because of the reationship between extinction and fine particle mass, these trends can be used to make some inferences about regional fine particle trends.