CMAQv5.4 Release Notes: Chemistry: Carbon Bond 6 Mechanism (CB6) with Hazardous Air Pollutants
William T. Hutzell, U.S. Environmental Protection Agency
Type of update: Science Update and New Feature
Release Version/Date: CMAQ version 5.4
Description The Multi-pollutant version of the cbr6 mechanism replaces the cb6mp_ae6_aq mechanism in version 5.3.3. The new mechanism is based on cb6r5_ae7_aq and is called cb6r5hap_ae7_aq. It includes the same toxic gas and aerosol species as the cb6mp_ae7_aq while adds (1) gas and aerosol reactive tracers for benzo[a]pyrene and (2) nonreactive tracers for PAHs lumped based on their Toxic Equivalency Factors.
Significance and Impact: Users can selectively model a wide range of Hazardous Air Pollutants based on the r5 version of the carbon bond 6 mechanisms in CMAQ 5.4.
