User's guide to CAL3QHC version 2. 0: A modeling methodology for predicting pollutant concentrations near roadway intersections

Technical Report · Sun Nov 01 04:00:00 EST 1992

OSTI ID:6210230

CAL3QHC is a microcomputer based model to predict carbon monoxide (CO) or other inert pollutant concentrations from motor vehicles at roadway intersections. The model includes the CALINE-3 line source dispersion model and a traffic algorithm for estimating vehicular queue lengths at signalized intersections. CAL3QHC enhances CALINE-3 by incorporating methods for estimating queue lengths and the contribution of emissions from idling vehicles. The model permits the estimation of total air pollution concentrations from both moving and idling vehicles. It is a reliable tool for predicting concentrations of inert air pollutants near signalized intersections. Because idle emissions account for a substantial portion of the total emissions at an intersection, the model is relatively insensitive to traffic speed, a parameter difficult to predict with a high degree of accuracy on congested urban roadways without a substantial data collection effort.

• Research Organization: Environmental Protection Agency, Research Triangle Park, NC (United States). Office of Air Quality Planning and Standards
• OSTI ID: 6210230
• Report Number(s): PB-93-210250/XAB; EPA--454/R-92/006
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ADMINISTRATIVE PROCEDURES
AIR POLLUTION MONITORING
ALGORITHMS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
COMPUTERIZED SIMULATION
COMPUTERS
CONTROL
DOCUMENT TYPES
ECOLOGICAL CONCENTRATION
EXHAUST SYSTEMS
FORECASTING
GASEOUS WASTES
MANUALS
MATHEMATICAL LOGIC
MONITORING
OXIDES
OXYGEN COMPOUNDS
PERMITS
POLLUTANTS
RELIABILITY
ROADS
SIMULATION
TRAFFIC CONTROL
URBAN AREAS
VEHICLES
WASTES