Assessment of Inhalation Exposures and Potential Health Risks to the General Population that Resulted from the Collapse of the World Trade Center Towers

In the days following the collapse of the World Trade Center (WTC) towers on September 11, 2001 (9/11), the U.S. Environmental Protection Agency (EPA) initiated numerous air monitoring activities to better understand the ongoing impact of emissions from that disaster. Using these data, EPA conducted an inhalation exposure and human health risk assessment to the general population. This assessment does not address exposures and potential impacts that could have occurred to rescue workers, firefighters, and other site workers, nor does it address exposures that could have occurred in the indoor environment. Contaminants evaluated include particulate matter (PM), metals, polychlorinated biphenyls, dioxins, asbestos, volatile organic compounds, particle-bound polycyclic aromatic hydrocarbons, silica, and synthetic vitreous fibers (SVFs). This evaluation yielded three principal findings. (1) Persons exposed to extremely high levels of ambient PM and its components, SVFs, and other contaminants during the collapse of the WTC towers, and for several hours afterward, were likely to be at risk for acute and potentially chronic respiratory effects. (2) Available data suggest that contaminant concentrations within and near ground zero (GZ) remained significantly elevated above background levels for a few days after 9/11. Because only limited data on these critical few days were available, exposures and potential health impacts could not be evaluated with certainty for this time period. (3) Except for inhalation exposures that may have occurred on 9/11 and a few days afterward, the ambient air concentration data suggest that persons in the general population were unlikely to suffer short-term or long-term adverse health effects caused by inhalation exposures. While this analysis by EPA evaluated the potential for health impacts based on measured air concentrations, epidemiological studies conducted by organizations other than EPA have attempted to identify actual impacts. Such studies have identified respiratory effects in worker and general populations, and developmental effects in newborns whose mothers were near GZ on 9/11 or shortly thereafter. While researchers are not able to identify specific times and even exactly which contaminants are the cause of these effects, they have nonetheless concluded that exposure to WTC contaminants (and/or maternal stress, in the case of developmental effects) resulted in these effects, and have identified the time period including 9/11 itself and the days and few weeks afterward as a period of most concern based on high concentrations of key pollutants in the air and dust.     

Understanding Management Performance

Current models of the factors underlying management performance make use of a variety of variables at different levels of analysis. A framework is presented in which variables of three different types are linked together. Using data from a sample (n = 437) of British managers this article explores relationships between personality factors (using the big-five factors), work competencies and managerial performance. Results from the analyses reveal a set of underlying competency factors, which show different patterns of correlation with two facets of performance: current proficiency and promotability. In turn, these factors and the facets of performance show relationships with the big-five personality factors. Current proficiency is more closely related to competencies of organization, specialization and analysis – competencies more likely to be displayed by people who are conscientious and introverted. Promotability is linked more closely to competencies concerning action/motivation, flexibility/sensitivity and communication – competencies more likely to be displayed by people who are extroverted with lower conscientiousness and agreeableness.     

Incorporation of historical controls using semiparametric mixed models

The analysis of animal carcinogenicity data is complicated by various statistical issues. A topic of recent debate is how to control for the effect of the animal's body weight on the outcome of interest, the onset of tumours. We propose a method which incorporates historical information from the control animals in previously conducted experiments. We allow non-linearity in the effects of body weight by modelling the relationship nonparametrically through a penalized spline. A simple extension of the penalized spline model allows the relationship between weight and the onset of tumour to vary from one experiment to another.     

Children in Need? Listening to Children whose Parent or Carer is HIV Positive

Correspondence to Kay Tisdall, University of Edinburgh School of Social and Political Studies, Adam Ferguson Building, George Square, Edinburgh EH8 9LL, UK. E-mail: K.Tisdall{at}ed.ac.uk Summary International attention is being brought to the global HIV/AIDS epidemic. In contrast, HIV and AIDS risk being forgottenissues for those living in Scotland. Yet in 2002, numbers ofreported infections have begun to rise. Children and young peopleare even more likely to be affected by parental HIV now, asparents live longer and are able to have more children. Verylittle is known in Scotland about affected children and whethercurrent service provision meets their needs. This research projectsought to address certain of these gaps, by gathering quantitativedata from service providers and qualitative data from interviewing28 affected children and young people. The research found adearth in policies and services, and a failure to audit need.HIV education in schools did not acknowledge that pupils mightbe living with parents who had HIV illness. Children and youngpeople tended to be very involved in the health care of theirparent but none of them received direct support from healthworkers. On the whole the children and young people did notenjoy support from statutory social workers but appreciatedthe support and activities provided by workers in the voluntarysector.     

Social Origins of Civil Society: Explaining the Nonprofit Sector Cross-Nationally

Recent research has usefully documented the contribution that nonprofit organizations make to social capital and to the economic and political development it seems to foster. Because of a gross lack of basic comparative data, however, the question of what it is that allows such organizations to develop remains far from settled. This article seeks to remedy this by testing five existing theories of the nonprofit sector against data assembled on eight countries as part of the Johns Hopkins Comparative Nonprofit Sector Project. The five theories are: (a) government failure/market failure theory; (b) supply-side theory; (c) trust theories; (d) welfare state theory; and (e) interdependence theory. The article finds none of these theories adequate to explain the variations among countries in either the size, the composition, or the financing of the nonprofit sector. On this basis it suggests a new theoretical approach to explaining patterns of nonprofit development among countries—the social origins approach—which focuses on broader social, political, and economic relationships. Using this theory, the article identifies four routes of third-sector development (the liberal, the social democratic, the corporatist, and the statist), each associated with a particular constellation of class relationships and pattern of state-society relations. The article then tests this theory against the eight-country data and finds that it helps make sense of anomalies left unexplained by the prevailing theories.