Neighborhood Assessment Program Step 2

This page last reviewed October 21, 2010

2. Cumulative-Impact Assessment Methodology

Objective: To develop source-receptor-based, cumulative-impact/risk assessment methodologies suitable for evaluating neighborhood-scale air pollution impacts from all nearby sources, including mobile sources, for comparing neighborhood-scale exposures within a region. With these methodologies, local decision-makers can then assess policy options for addressing neighborhood-scale environmental concerns. While recognizing that cumulative impacts will ultimately require multimedia effects evaluation, this effort would focus only on the air pathway.

  1. Identify Data and Methodology Gaps: Perform a literature survey to compile information on existing cumulative impact assessment methodologies and databases, including air dispersion models, total exposure and risk assessment models, emission inventories, and meteorological data. Identify the uncertainties associated with the methodologies and databases. Identify gaps in data and methodology, and determine the need for additional monitoring data, emission inventories, meteorological data, model development, and reconciliation of monitoring data and inventory estimates.
  2. Dispersion and Impact Assessment Model Development: Develop and refine the models, as needed, based on the methodology gaps identified in task 2(b) and following the pilot and supplemental assessments made in tasks 3 and 4.
  3. Evaluate Methodologies and Protocols: Evaluate the performance of protocols and methodologies applied in tasks 3 and 4 (i.e., an initial evaluation after the Barrio Logan Pilot and a second after the monitoring in supplemental test neighborhood studies) with respect to the monitoring, emission inventory, and/or health risk assessment data sets collected.
  4. Work Cooperatively with the Office of Environmental Health Hazard Assessment (OEHHA): Enlist OEHHA's expertise and guidance in developing a risk assessment and numerical index of neighborhood-scale cumulative risk, that includes the combined effects of criteria and toxic air pollution at the neighborhood-scale.
  5. Peer Review: Upon completion, all newly developed models and methods will be subject to a peer review process as routinely followed by the ARB.

Work Plan Step 3  >

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