Kiera Jefferson
The Environmental Protection Agency (EPA) is the primary regulator of particulate pollution in the United States. The EPA has been regulating levels of airborne particulate matter since 1971 and has implemented rules and standards to improve air quality and protect public health. States play a crucial role in ensuring attainment and maintenance of ambient air quality standards set by the EPA. Additionally, state agencies like the Minnesota Pollution Control Agency (MPCA) also study, monitor, and regulate air pollutants, including criteria pollutants, air toxics, and greenhouse gases.
| Characteristics | Values |
|---|---|
| Agency Name | Environmental Protection Agency (EPA) |
| Location | United States |
| Air Quality Standards | National Ambient Air Quality Standards (NAAQS) |
| Pollutant Focus | Particulate Matter (PM), including PM2.5 and PM10 |
| Regulatory Actions | Implementation plans, standards revision, monitoring, and control |
| State Involvement | State implementation plans (SIPs) and Prevention of Significant Deterioration (PSD) program |
| Advisory Committees | Clean Air Scientific Advisory Committee (CASAC) |
| Related Agencies | Minnesota Pollution Control Agency (MPCA) |
| Health Impact | Cardiovascular and respiratory illness, adverse birth outcomes, psychiatric disorders, Alzheimer's disease |
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What You'll Learn
The Environmental Protection Agency (EPA)
The EPA's work is guided by initiatives that aim to balance environmental protection with economic considerations. For example, one proposal is expected to save Americans $54 billion annually by repealing greenhouse gas standards for motor vehicles and engines, including the Biden EPA's electric vehicle mandate. The EPA also works to ensure that all Americans have access to clean drinking water and that contaminated sites are remediated.
The EPA employs a diverse range of professionals, including engineers, scientists, environmental protection specialists, legal experts, public affairs specialists, financial analysts, and information technologists. The agency's budgeted employee level in 2023 was 16,204.1 full-time equivalents, indicating a significant workforce dedicated to addressing environmental challenges.
In terms of regulating particulate matter (PM) pollution, the EPA sets national ambient air quality standards for common air pollutants, known as "criteria pollutants." The EPA provides a platform for the public to ask questions, provide feedback, or report problems related to particulate matter pollution. Additionally, the EPA works to implement regulatory actions for particulate matter, as mentioned in some of their web pages.
The EPA has faced challenges and controversies throughout its history. For example, in 2017, litigation was brought against Monsanto by individuals who claimed to have developed glyphosate-related non-Hodgkin's lymphoma. Documents revealed that Monsanto had influenced research conducted by academics and worked to downplay the health risks associated with its products. This incident highlighted the complex dynamics between regulatory agencies like the EPA and private sector entities.
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The Clean Air Act
In addition to the above, the Clean Air Act has also addressed specific issues such as acid rain and ozone layer protection. The Acid Rain Program (ARP), established under the 1990 Amendments, was the first cap-and-trade emissions program in the United States, targeting sulfur dioxide and nitrogen oxide emissions from power plants. The ozone program, on the other hand, is a technology transition program intended to phase out the use of chemicals that harm the ozone layer.
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State Implementation Plans (SIPs)
SIPs are developed by state agencies and approved by the EPA. They consist of narrative, rules, technical documentation, and agreements that a state will use to control and clean up polluted areas. For example, in Ohio between 1970 and 1977, a SIP was implemented to reduce the sulfur dioxide (SO2) emitted by coal-fired power plants. The plan involved increasing the height of the smokestacks, which resulted in the SO2 being carried by the wind out of the state and a subsequent reduction in measured SO2 levels in the nearby area.
The Lowest Achievable Emissions Rate (LAER) is used by the EPA to determine if emissions from new or modified major stationary sources are acceptable under SIP guidelines. LAER standards are required when a new stationary source is located in an area that does not meet air quality standards. This is the most stringent air pollution standard and is above the best available control technology and reasonably available control technology standards.
Before submitting SIPs to the EPA for approval, states may solicit comments from the public. Once a SIP is approved, it becomes a federally enforceable plan. States are required to periodically revise their SIPs to incorporate new regulations and standards. For instance, New York has submitted numerous SIP revisions to the EPA for approval, including the SIP Revision Incorporating 6 NYCRR Part 205, Architectural and Industrial Maintenance (AIM) Coatings, which was approved by the EPA in October 2022.
Overall, SIPs play a crucial role in ensuring that states take the necessary actions to improve air quality and protect public health and the environment. By developing and implementing comprehensive plans, states can effectively reduce air pollution and work towards achieving the NAAQS set by the EPA.
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The Prevention of Significant Deterioration (PSD) program
The PSD program specifically targets areas that are in attainment or unclassifiable with the National Ambient Air Quality Standards (NAAQS). These standards set a maximum allowable concentration ceiling for pollutants, known as the PSD increment. The PSD increment defines the maximum increase in pollutant concentration allowed above the baseline concentration for each specific pollutant. This baseline concentration is typically determined when the first complete PSD permit application for an area is submitted.
The PSD program requires the installation of the "Best Available Control Technology" (BACT) at these major sources of pollution. By implementing the most advanced pollution control measures, the program aims to minimise the impact of new emissions on air quality. The main objective of the air quality analysis under the PSD program is to demonstrate that new emissions from proposed major sources or modifications will not violate the NAAQS or PSD increment. This analysis involves assessing existing air quality through ambient monitoring and dispersion modelling, as well as predicting future ambient concentrations resulting from proposed projects.
Areas designated as Class I under the PSD program receive special protection. These areas are recognised for their exceptional natural, scenic, recreational, or historic value. The Federal Land Manager (FLM), including relevant state or Indian governing bodies, plays a crucial role in defining specific Air Quality Related Values (AQRVs) for these Class I areas. By involving local authorities, the PSD program ensures that the unique characteristics of each area are considered in maintaining and improving air quality.
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The Minnesota Pollution Control Agency (MPCA)
The MPCA studies, monitors, and regulates air pollutants, with a focus on three primary categories: criteria pollutants, air toxics, and greenhouse gases. Criteria pollutants refer to the six common air pollutants for which the U.S. Environmental Protection Agency (EPA) sets national ambient air quality standards. These include volatile organic compounds (VOCs), which are emitted from sources such as paint, solvents, adhesives, and fuel combustion. The MPCA also tracks and controls VOCs to help reduce ozone concentrations in the air.
Air toxics, another area of focus for the MPCA, include heavy metals such as chromium, arsenic, nickel, and lead. These metals are emitted from industrial processes and fossil fuel combustion and can pose health risks when present above certain benchmarks. Additionally, the MPCA addresses polycyclic aromatic hydrocarbons (PAHs), which are a class of over 100 chemicals found in sources like tobacco smoke, wood smoke, and vehicle emissions. PAHs contribute to the warming of the Earth's atmosphere and climate change.
The MPCA also regulates greenhouse gases, as required by the Clean Air Act. This includes monitoring and reporting emissions for six types of greenhouse gases. Furthermore, the MPCA works closely with farmers to develop solutions that not only support their agricultural practices but also contribute to a cleaner and more sustainable environment. By collaborating with various partners, the MPCA strives to make data-driven decisions that balance economic growth with environmental protection and sustainability.
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Frequently asked questions
Particulate matter refers to fine particles of dust, soot, smoke, liquid droplets, and other particles in the air that are small enough to be breathed in and enter the bloodstream.
The US Environmental Protection Agency (EPA) has regulated levels of airborne particulate matter since 1971. The EPA lays out a schedule for states to reach the standard, and states are primarily responsible for ensuring attainment and maintenance of ambient air quality standards once the EPA has established them. The Clean Air Act requires the EPA to set national ambient air quality standards for six common air pollutants, called "criteria pollutants".
The Minnesota Pollution Control Agency (MPCA) studies, monitors, and regulates air pollutants, primarily in three categories: criteria pollutants, air toxics, and greenhouse gases.
