In 2008, after a five-month
intensive investigation of toxic air pollution in the western areas of
Riverside and San Bernardino Counties, AQMD identified cement production in
the area as a source of elevated levels of the cancer-causing chemical
hexavalent chromium. As a result, AQMD took aggressive action to reduce the
hexavalent chromium emissions from the two cement plants in the area in
order to lower the cancer risk levels in the communities around the
facilities. In March 2009, the AQMD Governing Board adopted Amended Rule
1156 requiring comprehensive emissions mitigation measures as well as
requirements for fence line monitoring of hexavalent chromium at the two
facilities.
For more information on AQMD’s investigation, findings and next steps,
please see the links below.
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