Environmental Engineering Reference
In-Depth Information
8.1 Central California Ozone Study: Synthesis
of Results
Steven Reynolds
1
, Carol Bohnenkamp
2
, Ajith Kaduwela
3
, Bruce Katayama
4
,
Evan Shipp
5
, James Sweet
6
, Saffet Tanrikulu
7
, and Stephen Ziman
8
1
Envair, San Rafael, CA, USA
2
U.S. Environmental Protection Agency, Region 9, San Francisco, CA, USA
3
California Air Resources Board, Sacramento, CA, USA
4
Sacramento Metropolitan Air Quality Management District, Sacramento, CA, USA
5
Shipp Air Quality Consulting, Fresno, CA, USA
6
San Joaquin Valley Air Pollution Control District, Fresno, CA, USA
7
Bay Area Air Quality Management District, San Francisco, CA, USA
8
Ziman Consulting, San Francisco, CA, USA
This paper summarizes key findings of the Central California Ozone Study (CCOS).
CCOS is a multi-year program of meteorological and air quality monitoring, emission
inventory development, data analysis, and air quality simulation modeling. The
objectives of CCOS are: (1) obtain suitable aerometric and emission databases to
update, evaluate, and improve model applications for representing urban and
regional-scale ozone episodes in central and northern California to meet the regu-
latory requirements for 1-h and 8-h ozone standards; (2) identify feasible, cost
effective, and equitable emission controls to meet 1-h and 8-h ozone standards; (3)
determine the contributions of transported and locally generated emissions to
ozone formation and the relative benefits of volatile organic compound (VOC)
and oxides of nitrogen (NOx) emission controls in upwind and downwind areas;
and (4) assess the relative contributions of ozone generated from emissions in one
air basin to federal and State exceedances in neighboring air basins. The study
domain for CCOS covers all of central California and most of northern California,
extending from the Pacific Ocean to east of the Sierra Nevada and from Redding
to the Mojave Desert. The selection of this study area reflects the regional nature
of ozone exceedances, increasing urbanization of traditionally rural areas, and a
need to include all of the major flow features that affect air quality in the study
domain.
The CCOS program consists of five main components: (1) development of an
overall program plan, with particular emphasis on planning for the field measure-
ment study; (2) conduct of an intensive field monitoring study from 1 June to 2
October 2000; (3) development of the information to support data analyses and air
quality modeling; (4) development and evaluation of a suitable photochemical air
quality simulation model for the study area; and (5) identifying and evaluating
