Aviation Emissions and Air Quality Handbook  roadway intersections. $_{40}$,$_{41 }$ CAL3QHC combines the CALINE model with a traffic algorithm to  estimate delays and queues that occur at signalized intersections. This model  is used as a  screening model and is the EPA-recommended model for this application.  EPA also developed the CAL3QHCR model, which is a more refined version of CAL3QHC that  requires local hourly meteorological data. 42  CAL3QHCR incorporates enhancements to process  up to a year of meteorological data and emissions data that vary by day of the week and hour of  day. The model has the capability, with the use of various concentration-averaging algorithms, to  predict 1-hour, 8-hour, 24-hour, and annual concentrations, compared with only the maximum  hourly average computed by CAL3QHC. CAL3QHCR is the EPA-recommended model for PM  (i.e., PM$_{10 }$ and PM$_{2.5}$) hot-spot modeling for highway and roadway intersection  projects/action  and also EPA-recommended for CO when a CAL3QHC analysis with conservative assumptions  indicates a potential to exceed the NAAQS.  For further information on CAL3QHC/CAL3QHCR model inputs and guidance on how to  conduct a CO and PM hot -spot analysis see  Section 7.2  ( Roadway Dispersion Modeling ) and  Appendix E  ( Roadway Dispersion Modeling [Hot-Spot Analysis] ).  40 EPA Preferred/Recommended Models,  CALINE3,  http://www.epa.gov/ttn/scram/dispersion_prefrec.htm#caline3.  41 EPA,  User’s Guide to CAL3QHC Version 2.0: A Modeling Methodology for Predicting Pollutant  Concentrations Near Roadway Intersections , November 1992 [EPA-454-R-92-006],  http://www.epa.gov/ttn/scram/userg/regmod/cal3qhcug.pdf.  EPA Preferred/Recommended Models,  CAL3QHC/CAL3QHCR http://www.epa.gov/ttn/scram/dispersion_prefrec.htm#cal3qhc.  35$_{ }$