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Maine Achieves Attainment with the Fine Particle Air-Quality Standards

Release Date: 12/17/2004
Contact Information:

Contact Information: David Deegan, 617-918-1017

For Immediate Release: December 17, 2004; Release # dd-04-12-13

BOSTON - EPA analysis of air quality indicates that Maine has ambient concentrations of fine particles that meet current health standards.

Fine particles, frequently referred to as PM2.5, are less than 2.5 micrometers in diameter (approximately one-thirtieth the size of a human hair). Fine particles are unhealthy to breathe and have been associated with serious health impacts, including premature death from heart and lung disease, aggravation of heart and lung diseases (including chronic bronchitis and asthma), increased hospital admissions and doctor visits, and absences from work and school. These particles are derived from a variety of sources, including factories, power plants, trash incinerators, motor vehicles, construction activity and fires. In addition, fine particles are the major cause of reduced visibility (haze) in parts of the United States, including many of our national parks.

“We can be proud that air quality in most of New England attains the health-based Clean Air Fine Particle standards for fine-particle pollution,” said Robert W. Varney, regional administrator of EPA’s New England Office. "Even with this success, we need to ensure that standards continue to be attained and that, especially in urban areas, we continue efforts to reduce the amount of fine particles in the air that people breathe."

Nationally, EPA is taking numerous actions to reduce pollution from fine particles, including tougher emission limits for power plants in the eastern U.S. and tougher tailpipe emission limits and cleaner fuels for all cars, light-duty vehicles (including sport utility vehicles and minivans) and diesel trucks, beginning this year. In May 2004, EPA issued its Clean Air Nonroad Diesel Rule that will cut emission levels from construction, agricultural and industrial diesel-powered equipment by more than 90 percent.

Even though Maine will not be required to develop plans to bring their states into attainment with the standards, New England states will benefit from programs in predominantly upwind states to reduce their fine-particle levels. Some of the same pollutants that contribute to the formation of fine particles also contribute to formation of ground-level ozone, regional haze, and acid rain, all of which have serious environmental consequences for New England.

With support from EPA, the six New England states currently operate a network of over 100 monitors to measure fine particle concentration. This network is needed to measure progress in maintaining standards, and to provide real-time data so that EPA can alert the public when fine particle concentrations are high in any area of the New England region. During 2004, EPA New England awarded $456,000 in operating funds and in-kind services to Maine Department of Environmental Protection (DEP) for operation of its fine particle monitors. For Maine, EPA’s 2004 grant funds are being used for operation and maintenance of 13 fine particle monitoring sites, where the state operates filter-based samplers, continuous monitors or speciation samplers. Maine is also operating an advanced air monitoring station at Acadia National Park to study aerosol transport and regional haze.

EPA issued the fine particle standards in 1997 after evaluating hundreds of health studies and conducting an extensive peer review process. The annual standard is a level of 15 micrograms per cubic meter, based on the 3-year average of annual mean PM2.5 concentrations. The 24-hour standard is a level of 65 micrograms per cubic meter, determined by the 3-year average of the annual 98th percentile concentrations. Scientists, however, have not identified any "bright line" at which fine particle levels are not harmful to human health so it makes good sense for states to pursue voluntary measures that further reduce fine particle levels.

EPA and states have adopted many measures to decrease sources of fine particle pollution. These include measures addressing SO2 and NOx emissions from power plants, as well as regulations affecting heavy-duty diesel engines, highway vehicles, and other mobile sources that will reduce emissions of NOx, direct PM2.5, SO2 and volatile organic compounds (VOCs).
Some of the programs that states can pursue to reduce fine particle pollution include retrofitting engines in school buses, diesel trucks, and off-road vehicles; reducing sulfur levels in diesel and home-heating fuels, increasing anti-idling efforts and vehicle opacity testing, better enforcement of existing laws, and educational outreach. In Maine, for example, the DEP is using grant funds from EPA’s Clean School Bus USA program and state matching funds to retrofit over 400 school buses with oxidation catalysts.

For more information on today's announcement, visit: www.epa.gov/region1/airquality/partic.html. National information on EPA’s Clean Air Fine Particle standards is available at: http://www.epa.gov/pmdesignations/ .

Related Information:
Particulate Matter in New England
EPA’s Clean Air Fine Particle standards
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