The District’s CEQA community risk and hazards screening tools are provided for lead agencies to

consider in deciding whether there should be further environmental review of a project. Lead agencies

may use the screening tools to assess a project’s potential risk and hazard impacts, compare the results

to the lead agency’s applicable thresholds of significance, and determine whether additional analysis is

necessary. The screening tools provide conservative estimates and are not based on actual Health Risk

Screening Assessments. A refined analysis, including modeling, should be conducted for more accurate,

and most likely lower, risk and hazard estimates. The screening tools are not intended to discourage infill

development or affordable housing. The screening tools will continue to be updated to reflect the best

available data. Contact the District for additional guidance on the tools and for conducting a more

Local Risk and Hazards (Modeling Report) (http://www.baaqmd.gov/Divisions/Planning-and-

Research/CEQA-GUIDELINES/Tools-and-Methodology.aspx) or contact District staff.

The following tools will be needed for the screening analysis:

• Google Earth, a free program – http://www.google.com/earth/index.html

• Stationary Source Screening Analysis Tool – County specific Google Earth (KML) files that map all the

stationary sources permitted by the District with risk and hazard estimates (tool does not estimate

acute hazards since the levels were found to be extremely low),

http://www.baaqmd.gov/Divisions/Planning-and-Research/CEQA-GUIDELINES/Tools-and-

Methodology.aspx

the screening levels were found to be extremely low), http://www.baaqmd.gov/Divisions/Planning-

and-Research/CEQA-GUIDELINES/Tools-and-Methodology.aspx

• Local road traffic count data from the California Environmental Health Tracking Program –

http://www.ehib.org/traffic_tool.jsp

Please note that risk reduction strategies may

be considered and implemented at each step of

the screening process. Risk reduction strategies

include, but are not limited to:

 Setback/site design to reduce potential

forecasted model year for roadways

generates reduced impacts.

 Confirm that dry cleaners will be phasing out

perc by project build out date.

 Install emission controls on back-up

generators.

Contact District staff for additional risk

reduction strategies as needed.

akirk@baaqmd.gov.

BAAQMD CEQA GUIDELINES

Risk and Hazard Screening Analysis Process Flow Chart

Permitted Sources:

• Click on the points in Google Earth to

see estimated PM

and hazard values for the identified

permitted sources.

and east/west or north/south

direction from the project.

Major Roadways:

• Download the county-specific

Roadway Screening Analysis Tables

from the District’s website. Look-up

PM

on the roadway’s AADT, distance

from the project, and east/west or

applicable thresholds as determined

by the lead agency. Sum all the

sources’ impacts for comparison to

applicable cumulative thresholds.

Permitted Sources:

• If the results of the refined

screening exceed any thresholds,

the user may opt to conduct site-

specific air modeling analysis. See

permit files.

Highways and Major Roadways:

• Risk, PM

2.5

, and hazard values for

highways and major roadways may

be further refined with modeling

using local traffic and meteorology

data. See Section 4.0 in the

Modeling Report for additional

guidance.

Sum all the sources’ impacts for

comparison to applicable

cumulative thresholds.

Permitted Sources:

• District staff can provide tips for

scaling concentrations based on

distance.

Highways and Major Roadways:

AADT, divide the actual AADT by the

AADT in the screening table.

Multiply that value with the risk in

the screening table:

(Actual AADT/Screening AADT) x

Screening Value = Actual AADT

Value. See Section 3.1.2 in the

Modeling Report for additional

guidance.

• To refine estimates based on the

exact distance of the roadway to the