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Air Toxics Study Shows 15 Percent Reduction in Cancer Risk

Jan. 4, 2008

DIAMOND BAR – Air pollution programs have reduced Southland residents’ risk of cancer from toxic air pollution by at least 15 percent in the past seven years, according to a landmark study released today by the region’s clean air agency.

“This reduction in cancer risk shows that we are on the right track in tackling toxic air pollution,” said William Burke, Ed.D., Governing Board Chairman of the South Coast Air Quality Management District.

“However, the remaining cancer risk is completely unacceptable.  Thousands of residents are getting sick and dying from toxic air pollution.  Some of them live in low-income, minority neighborhoods that may be heavily impacted by cancer-causing air pollution.  We must continue to fight for cleaner ships, locomotives, trucks and other sources of toxic air pollution to improve the health of all Southern California residents.”

The study conducted by AQMD and dubbed MATES III (Multiple Air Toxics Exposure Study) is the latest and most sophisticated air toxics research effort ever conducted in Southern California.  Its chief findings are that:

  • On average, Southland residents are exposed to a lifetime cancer risk from toxic air pollution of 1,200 in 1 million.  That is a 15 percent reduction from the average risk estimated in AQMD’s last air toxics study conducted in 1998-1999, but still one of the highest risks in the country;
  • The highest computer-modeled risk level is in the port area with a maximum lifetime cancer risk of up to 2,900 in a million;
  • Diesel exhaust accounts for approximately 84 percent of region-wide cancer risk and mobile sources -- including cars and trucks as well as ships, trains, aircraft and construction equipment -- account for 94 percent of the total risk; and
  • Sites with higher levels of cancer risk due to air toxics include Burbank, downtown Los Angeles, Fontana, Huntington Park and Wilmington.  The site with the lowest risk is Anaheim.

“This reinforces the policy agenda we have pursued for the past several years,” Burke said.  “Mobile sources and especially diesel-fueled vehicles are by far the largest source of our air pollution problem.  We will continue to do everything in our ability to address this public health threat.”

AQMD staff will now solicit public comments on the study for 90 days before finalizing the report.  AQMD also will prepare an update to its Air Toxics Control Plan to include strategies for further reducing toxic air pollution and cancer risk based on MATES III findings.  The proposed plan will be presented to AQMD’s Board this summer.

AQMD leadership in reducing toxic air pollution

AQMD has worked to reduce toxic emissions for several decades and elevated the issue to a higher priority in 1997 when its Governing Board adopted AQMD’s first Environmental Justice Initiatives.  As part of those initiatives, in 1998 and 1999 AQMD carried out MATES II, the most ambitious and far-reaching study at the time of toxic air pollution in an urban setting.

Following MATES II, AQMD adopted numerous rules and incentive programs to reduce toxic emissions, including:

  • AQMD’s clean fleet rules, which have resulted in the purchase of hundreds of clean-fueled transit buses, school buses, refuse trucks, street sweepers and other vehicles;
  • Regulations that have significantly reduced emissions of perchloroethylene (“perc”) at dry cleaners and other industries; hexavalent chromium from metal plating shops and protected schools from toxic air pollutants from new sources;
  • Collaboration with the ports of Los Angeles and Long Beach to establish the ports’ Clean Air Action Plan, a landmark program to cut diesel emissions from ships, trucks, trains and other sources;
  • Use of well over $100 million in incentive funds to reduce diesel emissions from school buses, tug boats and trucks in the ports and other sources of diesel exhaust; and
  • Adoption in January 2007 of AQMD’s Mobile Source Fair Share Initiative, which led to introduction of the Marine Vessel Emissions Reduction Act in Congress last year.  If approved, the measure would compel the U.S. Environmental Protection Agency to reduce toxic and smog-forming pollution from ships.

In addition to AQMD, regulations and programs instituted by the California Air Resources Board and the ports of Los Angeles and Long Beach have contributed to significant diesel emission reductions in recent years.

AQMD is the air pollution control agency for Orange County and major portions of Los Angeles, San Bernardino and Riverside counties.

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This page updated: January 15, 2008
URL: http://www.aqmd.gov/news1/2008/MATESIIIPR.html

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