U.S. Environmental Protection Agency (EPA) Assistant
Administrator Gina McCarthy announced Friday that they are proposing new air quality particulate standards to go into effect in December 2012. Though EPA is
required to review air standards every five years under the Clean Air Act and
had apparently already decided on reducing the particulate level, EPA wanted to
delay the new standards until 2013. However, a suit filed by eleven states: New
York, Connecticut, Delaware, Maryland, Massachusetts, New Mexico, Oregon, Rhode
Island, Vermont, Washington and California and several environmental groups
forced the EPA to act now. The court found that the EPA failed to adequately
explain how the primary annual 2.5 micron particulate standard (PM 2.5) provided
an adequate margin of safety for the most vulnerable-children, the infirm and
the old.
A study of children in Southern California showed lung
damage associated with long-term particulate exposure, and a multi-city study found
decreased lung function in children associated with long term particulate
exposure. These two studies appeared to warrant a more stringent annual particulate
standard according to the court. The United States particulate levels are a
small fraction of the levels in the worst areas of the world-Beijing, New
Delhi, Santiago (Chile), Mexico City, Ulaanbaatar (Mongolia), Cairo (Egypt),
Chongqing (China), Guangzhou (China), Hong Kong, and Kabul (Afghanistan).
Currently, under the Clean Air Act the US EPA has
established both annual and 24-hour PM2.5 air quality standards (as well as
standards for other pollutants). The annual standard is 15 ug/m3 (an air quality index, AQI of 49). The 24-hr standard was last revised to a level of 35
ug/m3 (an AQI of 99). These standards were last reviewed in 2006, but no change
was made at that time. It was reported that the EPA’s analysis found a lower
standard for the annual exposure would have prevented almost 2,000 premature
deaths each year. Combustion engines and coal burning power plants are
key contributors to PM2.5 particles, and according to the US EPA and World
Health Organization, the smaller, finer pollutant particles measured by PM2.5
are especially dangerous for human health. Studies have shown that there is an increased
risk of asthma, lung cancer, cardiovascular problems, birth defects and
premature death from particles smaller than 2.5 microns in diameter that lodge
deep in the lungs.
According to the Lung Association, the two biggest air
pollution threats in the United States are ozone and particle pollution. Other
pollutants include carbon monoxide, lead, nitrogen dioxide, sulfur dioxide and
a variety of toxic substances including mercury that appear in smaller
quantities. The EPA, requires states to monitor air pollution to assess the
healthfulness of air quality and ensure that they meet minimum air quality
standards. The recently challenged, Cross-State Air Pollution Rule (CSAPR) was
intended in part to prevent pollution from one state from moving into other
states and preventing them from meeting their goals because several states have
been unable to meet the current standard. PM2.5 particles can be either
directly emitted or formed via atmospheric reactions. Primary particles are
emitted from cars, trucks, and heavy equipment, as well as residential wood
combustion, forest fires, and agricultural waste burning. The main components
of secondary particulate matter are formed when pollutants like NOx and SO2
react in the atmosphere to form particles. However, studies have shown that air currents over the Pacific are carrying elevated particulate levels into California presumably from China.
According to American Lung Association State of the Air Report, Pittsburgh had the highest particle pollution in the nation on an
annual basis. Seven cities averaged particulate levels higher than the 15 ug/m3
current standard allows: Bakersfield, CA; Hanford, CA; Los Angeles, CA;
Visalia, CA; Fresno, CA; Pittsburgh, PA; and Phoenix, AZ. The American Lung
Association in their latest report states that twenty cities actually have
average year-round particle pollution below the current regulated level, but
above the proposed EPA air quality standard of 12-13 ug/m3. The maximum 24 hour
standard will remain unchanged at 35 ug/m3.
I would like to add that the EPA is reviewing public comments on the proposal and is required by the court-approved consent decree to issue final rules by 14 December 2012. Mitigation measures are supposed to begin by 2015 and must be fully implemented by 2020.
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