Roadway Modeling using CAL3QHCR (A Line Source Model) Originally developed for CO hotspots We work directly in the model; no interface Today I will show you how to model PM from roadway, and how to calculate potential cancer risk. Inhalation pathway only.

Line source model Input data CAL3QHCR Model Line source model Input data Sequential meteorological data (ISCST3 meteorological input files) Emission factors Roadway link information Traffic data Receptor locations

Methodology for Preparing Traffic Data Inputs Procedure described in detail in the Guidelines Data sources Peak vehicles/hour for road segment from CALTRANS (http://www.dot.ca.gov/hq/traffops/saferesr/traffdata/) BURDEN run with hourly output from EMFAC Key assumptions Gasoline PM is as toxic as diesel PM Ratio of cars to trucks is the same on all roadways throughout the county

Standard Inputs

Example Project Location We’ll be using the peak hourly traffic volume from this stretch of business 80 Note the rail line to the south. We will not be modeling emission from that rail line, although in real life we’d ask for those emissions to be considered in the risk assessment

Cancer Risk Results

Graph Cancer Risks with Distance Risk drops with distance

Other CAL3QHCR Features Used for modeling only roadway sources Add results from modeling other source types with ISCST3 or AERMOD Can be used to model: Traffic intersections Traffic signaling Queuing

Questions