E. T. Hayes

Spatial variations in airborne microorganism and endotoxin concentrations at green waste composting facilities.

The emission and dispersal of bioaerosols from open-air commercial composting facilities continues to be contentious. A meta-dataset enumerating cultivable microorganism emission and downwind concentrations is not yet available. A dataset derived from repeated and replicated field studies over a period of two years at two commercial composting facilities is presented. The data characterises patterns in Aspergillus fumigatus, actinomycetes, Gram-negative bacteria and endotoxin emission and downwind concentrations. For all bioaerosols, compost agitation activities had a significant impact on concentrations; levels were variable up to 600 m downwind from site. Bioaerosols declined rapidly from source and exhibited a secondary peak 100-150 m from site boundary. All bioaerosols were found downwind from site in elevated concentrations. Compared to those found 100 m upwind, levels were significantly higher at 180 m downwind for A. fumigatus; at 300-400 m for actinomycetes and Gram negative bacteria, and at 100 m for endotoxins. Periodically, elevated concentrations could be found for all bioaerosols at distances further downwind. The evidence provided by this data set provides operators and regulators of facilities with reliable data to inform the location, risk assessment and bioaerosol sampling strategies of commercial composting facilities.

Endotoxin emissions from commercial composting activities

This paper describes an exploratory study of endotoxin emissions and dispersal from a commercial composting facility. Replicated samples of air were taken by filtration at different locations around the facility on 10 occasions. Measurements were made of endotoxin and associated culturable microorganisms. The inflammatory response of cell cultures exposed to extracts from the filters was measured. Endotoxin was detected in elevated concentrations close to composting activities. A secondary peak, of lesser magnitude than the peak at source was detected at 100-150 m downwind of the site boundary. Unexpectedly high concentrations of endotoxin were measured at the most distant downwind sampling point. Extracted endotoxin was found to stimulate human monocytes and a human lung epithelial cell line to produce significant amounts of pro-inflammatory cytokines. On a weight basis, endotoxin extracted from the composting source has a greater inflammatory cytokine inducing effect than commercial E. coli endotoxin.

Exploring a city's potential low carbon futures using Delphi methods: some preliminary findings

This paper describes a Delphi methodology to generate a number of broadly consensual low carbon scenarios for 2050. This approach to ‘creating’ the future, rather than predicting, is useful when dealing with profound and uncertain change over a long period of time and is therefore suited to carbon management. The methodology is described, and the first stage of the consultation process is discussed with reference to its application in the UK city region of Bristol. Findings from the first round have resulted in the identification of seven working scenarios and patterns in the responses of individuals from different backgrounds, suggesting that strong world-views and agendas are present within groups. Subsequent rounds of a questionnaire and a backcasting workshop will refine these working scenarios and identify pathways to achieve them.

The rhetoric and realities of integrating air quality into the local transport planning process in English local authorities.

Regardless of its intent and purposes, the first decade of the Local Air Quality Management (LAQM) framework had little or no effect in reducing traffic-related air pollution in the UK. Apart from the impact of increased traffic volumes, the major factor attributed to this failure is that of policy disconnect between the process of diagnosing air pollution and its management, thereby limiting the capability of local authorities to control traffic-related sources of air pollution. Integrating air quality management into the Local Transport Plan (LTP) process therefore presents opportunities for enabling political will, funding and joined-up policy approach to reduce this limitation. However, despite the increased access to resources for air quality measures within the LTP process, there are local institutional, political and funding constraints which reduce the impact of these policy interventions on air quality management. This paper illustrate the policy implementation gaps between central government policy intentions and the local government process by providing evidence of the deprioritisation of air quality management compared to the other shared priorities in the LTP process. We draw conclusions on the policy and practice of integrating air quality management into transport planning. The evidence thereby indicate the need for a policy shift from a solely localised hotspot management approach, in which the LAQM framework operates, to a more holistic management of vehicular emissions within wider spatial administrative areas.

Evaluation of inflammatory effects of airborne endotoxin emitted from composting sources

Because of the lack of effective methodology, the biological effects of environmental endotoxin have not been assessed. Here we have collected and measured airborne endotoxin at different locations around composting sites. Increased endotoxin concentrations were observed close to composting activities and also at nearby boundary areas. Analysis of proinflammatory effects of the environmental endotoxin on interleukin (IL)-8 and IL-6 release from human D562 pharyngeal epithelial and MM6 monocytic cell cultures showed an association between endotoxin level and cytokine induction. The cytokine-inducing effect of bioaerosol extracts was inhibited by polymyxin B, indicating that endotoxin was the cause of cytokine responses we found. The environmental endotoxin was also more active for stimulating cytokines in airway epithelial cells than commercially purified Escherichia coli endotoxin. Our results suggest that these in vitro inflammatory cell models may contribute to the assessment of health impacts of environmental endotoxin.

A longitudinal study of the links between Local Air Quality Management and Local Transport Planning policy processes in England

The second round of the Local Transport Plan (LTP2) process in England presents unique challenges and opportunities for integrating Local Air Quality Management (LAQM) within current transport planning policy. Using content analysis of LTP2 documents from nine English authorities, and results from a questionnaire survey of local government officers undertaken in late 2007, this paper charts the changes in the integration of air quality management within the transport planning process since 1997. While substantial improvements in policy integration were observed within the selected case studies, the paper demonstrates that such improvements are often constrained by institutional complexities that create implementation gaps between national objectives and local decision-making outcomes.

Exploring barriers to and opportunities for the co-management of air quality and carbon in South West England: a review of progress

Due to the common sources of emissions of both air quality pollutants and greenhouse gases, management measures directed at one category of emissions are likely to positively impact the other. Through the local air quality management (LAQM) process, local authorities are required to monitor and measure specified air pollutants, the sources of which are also common to the primary sources of carbon emissions at a local level. This research tracks the progression of local authority management of carbon emissions and examines the barriers and opportunities for the integration of carbon emissions into the LAQM process. Results are triangulated from three core research methods deployed in South West England: a time series of local authority questionnaire surveys; secondary data analysis of active Air Quality Action Plans; and case study interviews of six local authorities in the region. The research concludes that the absence of statutory targets for carbon emission reductions remains a substantial barrier for local authority carbon management initiatives. However, in order to utilise scarce resources in the most efficient manner, local authorities should draw upon the existing skill set of their Air Quality Officers.

Air quality action planning: why do barriers to remediation in local air quality management remain?

UK local air quality action planning has failed to remediate exceedances of air quality targets, particularly for nitrogen dioxide, which are widespread and persistent a decade after the first local action plans were drafted. This paper is relevant to a range of administrations charged with managing air quality. Using a literature review and local authority survey, it explores barriers to improving air quality, i.e. resource limitations, absence of local authority powers, and a lack of intra-governmental co-operation and inter-governmental co-ordination. It concludes that the causes of these inefficiencies are flawed subsidiarity and devolved responsibility decoupled from the powers necessary to implement required actions. Challenging opportunities to reconceptualise air quality action planning to protect public health are suggested.

Air quality action plans in the UK: An overview and evaluation of process and practice

Local Air Quality Management is an effects-based process by which local authorities are required to review and assess their local air quality in relation to health-based air quality objectives. Where it is predicted that objectives will not be met and members of the public are exposed to elevated levels of pollutants, authorities are required to declare Air Quality Management Areas (AQMAs) and subsequently develop and implement Air Quality Action Plans (AQAPs) to improve air quality to acceptable levels. The majority of AQMAs (>90%) are predominantly transport related, and as such Local Transport Plans (LTPs) will be critical to the successful implementation of measures to improve air quality. LTPs are currently moving into the second round of a 5-year cycle of planning, with Plans being submitted to Government in July 2005 to cover the 2006-2011 period. In order to align AQAP and LTP more closely, and to reduce the number of policies and plans required of councils, local authorities with air quality problems arising from transport emissions have the freedom to include AQAPs within their LTP. LTP’s now include air quality as one of the four priorities. This move to integrate the two processes is seen largely as positive, but it is still unknown how the two processes (which still work to different timescales and report to different government departments) will be implemented in practice. This paper will provide an overview of the air quality action planning and local transport planning processes and then review three case study local authorities to examine the practice of air quality action planning in the context of air quality, organisational and political challenges.

Air pollution, deprivation and health: understanding relationships to add value to local air quality management policy and practice in Wales, UK

Background Air pollution exposure reduces life expectancy. Air pollution, deprivation and poor‐health status combinations can create increased and disproportionate disease burdens. Problems and solutions are rarely considered in a broad public health context, but doing so can add value to air quality management efforts by reducing air pollution risks, impacts and inequalities. Methods An ecological study assessed small‐area associations between air pollution (nitrogen dioxide and particulate matter), deprivation status and health outcomes in Wales, UK. Results Air pollution concentrations were highest in ‘most’ deprived areas. When considered separately, deprivation‐health associations were stronger than air pollution‐health associations. Considered simultaneously, air pollution added to deprivation‐health associations; interactions between air pollution and deprivation modified and strengthened associations with all‐cause and respiratory disease mortality, especially in ‘most’ deprived areas where most‐vulnerable people lived and where health needs were greatest. Conclusion There is a need to reduce air pollution‐related risks for all. However, it is also the case that greater health gains can result from considering local air pollution problems and solutions in the context of wider health‐determinants and acting on a better understanding of relationships. Informed and co‐ordinated air pollution mitigation and public health action in high deprivation and pollution areas can reduce risks and inequalities. To achieve this, greater public health integration and collaboration in local air quality management policy and practice is needed.