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Title:

Improvements to the CAL3QHCR Model
Cover of Improvements to the CAL3QHCR Model

Accession Number:

01515408

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

The CAL3QHCR model is designated as a preferred model for regulatory applications involving highways in the U.S. Environmental Protection Agency’s (EPA) Guideline on Air Quality Models. As a result, it is used for a number of regulatory and non-regulatory applications, including project-level conformity analyses, highway air quality analyses relevant to the National Environmental Policy Act; health impact studies; and research. The model improvements that have been made include: 1) simplify and update the input file structure; 2) allocate receptor and link arrays at runtime; 3) eliminate the internal rounding of 1-hour average concentration predictions; 4) enhance the emission, traffic, and signalization (ETS) pattern function to account for month of year and hour of day variations in addition to day of week variations; 5) supplement the ability to consider background concentrations as a function of ETS patterns; 6) add the capability to process multiple years of meteorology in a concatenated file; and 7) update the output file structure. These improvement were made without affecting the concentration estimates produced by CAL3QHCR and as such, the preferred status of the model is unchanged a provided for in Title 40 of the Code of Federal Regulations, Part 51, Appendix W, Section 3.1.2b. Two non-regulatory options have also been added: 1) using meteorology processed by the AERMOD meteorological processor, AERMET and 2) estimating downwind dispersion based on the AERMOD formulation for computing vertical and horizontal dispersion coefficients.

Supplemental Notes:

This paper was sponsored by TRB committee ADC20 Transportation and Air Quality. Alternate title: Improvements to CAL3QHCR Model

Monograph Accession #:

01503729

Report/Paper Numbers:

14-5142

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Claggett, Michael

Pagination:

18p

Publication Date:

2014

Conference:

Transportation Research Board 93rd Annual Meeting

Location: Washington DC
Date: 2014-1-12 to 2014-1-16
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References; Tables

Subject Areas:

Environment; Highways; I15: Environment

Source Data:

Transportation Research Board Annual Meeting 2014 Paper #14-5142

Files:

PRP, TRIS, TRB, ATRI

Created Date:

Jan 27 2014 3:48PM