high correlations among the daily measurements at the
existing PM10 monitors are suggestive of a relatively consistent
citywide pattern of exposure influenced by broad
weather systems. The separate influence of weather factors,
including temperature, humidity, and dewpoint,
were modeled using either linear terms or smoothing
functions and did not appear to confound the estimated
effect of air pollution.
CONCLUSION
Additional monitoring and analysis of both the fine and
coarse fraction of PM10 would help determine future control
strategies and the role of combustion particles versus
construction dust and other coarse particles. However, the
existing evidence indicates that significant public health
benefits will accrue from reductions in PM in Bangkok.
ACKNOWLEDGMENTS
The authors thank Dr. Supat Wangwongwatana of the
Royal Thai Government, Pollution Control Division, for
his support and assistance with the Bangkok study. The
study was funded by a grant from the Government of Japan
to the Royal Thai Government, administered by the
World Bank. This paper presents the views of the authors
and does not necessarily reflect any official positions of
the World Bank, the Royal Thai Government, the State of
California, or the authors’ employers. Errors and omissions
are the responsibility of the authors.