CCAP Transport Emissions Guidebook
Developer
Developed by the Center for Clean Air Policy (CCAP) with support and assistance from the US
Environmental Protection Agency, the Surdna Foundation, and the US Department of
Transportation’s Center for Climate Change and Environmental Forecasting.
Location
http://www.ccap.org/safe/guidebook/guide_complete.html
Methodology
The guidebook (or toolkit) is designed to inform state and local officials as to the extent that
policy decisions may impact on air pollution, energy use and GHG emissions. The purpose of the
CCAP Transportation Emissions Guidebook is to provide basic ‘rules of thumb’ to calculate
emissions reductions from the implementation of a range of forty specific transportation and land
use policies. The guidebook consists of two parts:

Part One: Land Use, Transit & Travel Demand Management
The first section focuses on policies related to travel demand and examines the impacts of
land use and investment decisions on transportation emissions. Nineteen policies are
analyzed include: transit-oriented development, bicycle initiatives, bus rapid transport,
light rail, comprehensive smart growth policy, road pricing, etc.

Part Two: Vehicle Technology and Fuels
The second part of the guidebook focuses on measures that influence vehicle technology,
fuel and operational choices that impact transportation emissions. Twenty-one policies
are discussed include: feebates, hybrid vehicles, biofuels, low-rolling resistance tires,
vehicle scrappage, emissions standard enforcement, freight mode shift, driver training,
etc. This final part was released in 2005.
The guidebook allows the user to input data for Business as Usual and “with measure” data for a
future date to estimate the emissions reductions achievable. The tool that consists of a
spreadsheet tool, or Guidebook Emissions Calculator, which enables users to quantify the
emissions benefits from a variety of projects and policies, a series of policy briefs, and a
technical appendix.
US EPA emission factors are used and the calculations are based on weighted averages from
emission factors from car and truck fleet.
Inputs
The inputs required for each scenario are basic and the input requirements differ between the
different scenarios.
Vehicle Categories
The toolkit requires basic details on vehicle categories for Part One only. The majority of the
calculators require a percentage between just a few vehicle types, for example “automobile” and
“transit/walking/biking”.
Fuel types
Not included.
Pollutants/Gases Analyzed
Criteria Pollutants
CO: Carbon Monoxide
NOx: -Nitrogen Oxides
SO2: Sulfur Dioxide
PM: Particulate Matter
(PM10 and PM2.5)
Toxic Pollutants
GHGs
VOC: Volatile Organic
Compounds
CO2: Carbon
Dioxide
N2O: Nitrous Oxide
CH4: Methane
Evaluation
Strengths
Weaknesses
Simple tool to calculate “rule of
The simplicity may preclude more inthumb” ex-ante emissions reductions. depth measurements of emissions and
emissions reductions. The basic
Covers a large range of policy
analysis should be acknowledged.
options to allow a comparison
between measures.
First cut tool for policy makers to
quickly assess environmental
impacts which may stimulate further
assessment.
Not sophisticated enough for full exante or ex-post appraisals.
Emission factors are based on US EPA
factors and are not directly relevant to
the Latin American fleet.