On-Road Emissions - Background
This page last reviewed April 14, 2010
INVENTORY OVERVIEWAn Accounting of the Emissions Attributable to On-Road Mobile Sources
Who uses the inventory?Why do we need an inventory?
What is the On-Road Emissions Inventory?
How is it calculated?
Where does the data come from?
EMFAC OVERVIEW
A Powerful Emissions Modeling Tool for Quantification of Pollutants for On-Road Mobile Sources
What is EMFAC?What does EMFAC estimate and report?
What types of vehicles and pollutants are included in EMFAC?
What is the "What If" Scenario Generator?
What are future changes on the horizon for EMFAC?
What is a "Correction Factor" or a "Basic Emission Rate" and what is the basis for their developments?
How is EMFAC used in planning and in assessing future emission control reductions?
ON-ROAD ACTIVITY OVERVIEW
County Estimates of Population and Travel
What are vehicle miles travel, population, and mileage accrual rates?How are these terms related?
Does vehicle age make a difference?
What are speed distributions and why are they important?
What are trips versus starts?
Why is inactivity important?
CALIFORNIA GEOGRAPHIC AREAS
General Information about CA including Geography, Population, and Vehicle Fleet Characteristics
What are the CA Air Pollution Control Districts?What are the CA counties?
Why use county-specific information for Air Quality assessment?
Where does the data come from and what are the difficulties in using it?
