Cal3qhc Model

While the CAL3QHC model (U.S. EPA 1992c) is not officially part of the Appendix A models, it is a recommended model for CO emissions in the Guidelines on Air Quality Models (U.S. EPA 1993). The model predicts carbon monoxide concentrations at signalized intersections. In effect, the model determines the increase in emissions and their resultant concentrations during queuing periods at stoplights. A version of the model, referred to as CAL3QHCR, a) At Grade Section a) At Grade Section b) Cut Section b) Cut Section c) Fill Section c) Fill Section

d) Bridge Section

FIG. 5.8.17 Four roadway cross sections treated by the CA-LINE3 model.

d) Bridge Section

FIG. 5.8.17 Four roadway cross sections treated by the CA-LINE3 model.

has recently been created to process up to a year of meteorology, vehicle emissions, traffic volume, and signaliza-tion data.

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