DATACENTERS clean air act united states
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Some of the notable hazardous air pollutants include:
Benzene (found in gasoline)
Asbestos
Formaldehyde
Lead compounds
Mercury compounds
Chloroform
Arsenic compounds
Cadmium compounds
Dioxins and furans
Polychlorinated biphenyls (PCBs).
Under the CAA, hazardous air pollutants (HAPs, or air toxics) are air pollutants other than those for which NAAQS exist, which threaten human health and welfare. The NESHAPs are the standards used for controlling, reducing, and eliminating HAPs emissions from stationary sources such as industrial facilities.
The 1970 CAA required EPA to develop a list of HAPs, and then develop national emissions standards for each of them. The original NESHAPs were health-based standards.
The 1990 CAA Amendments (Pub. L. 101–549 Title III) codified EPA's list, and required creation of technology-based standards according to "maximum achievable control technology" (MACT). Over the years, EPA has issued dozens of NESHAP regulations, which have developed NESHAPs by pollutant, by industry source category, and by industrial process. There are also NESHAPs for mobile sources (transportation), although these are primarily handled under the mobile source authorities. The 1990 amendments (adding CAA § 112(d-f)) also created a process by which EPA was required to review and update its NESHAPs every eight years, and identify any risks remaining after application of MACT, and develop additional rules necessary to protect public health.
=== New Source Performance Standards ===
The New Source Performance Standards (NSPS) are rules for the equipment required to be installed in new and modified industrial facilities, and the rules for determining whether a facility is "new".
The 1970 CAA required EPA to develop standards for newly constructed and modified stationary sources (industrial facilities) using the "best system of emission reduction which (taking into account the cost of achieving such reduction) the [EPA] determines has been adequately demonstrated." The EPA issued its first NSPS regulation the next year, covering steam generators, which emit carbon dioxide (CO2), nitrogen oxides (NOx), sulfur dioxide (SO2), particulate matter (PM), carbon monoxide (CO), volatile organic compounds (VOCs), and mercury; incinerators, which release dioxins and furans, PM, heavy metals (e.g., lead, mercury, cadmium), CO, hydrochloric acid (HCl), SO2, and NOx; Portland cement plants, which emit PM, NOx, SO2, CO, VOCs, and heavy metals; nitric acid plants, which produce NOx, nitrous oxide (N2O), and ammonia (NH3); and sulfuric acid plants, which discharge SO2, sulfur trioxide (SO3), and acid mist (PM). (36 FR 24876). Since then, EPA has issued dozens of NSPS regulations, primarily by source category. The requirements promote industrywide adoption of available pollution control technologies. However, because these standards apply only to new and modified sources, they promote extending the lifetimes of pre-existing facilities.
In the 1977 CAA Amendments, Congress required EPA to conduct a "new source review" process (40 CFR 52, subpart I) to determine whether maintenance and other activities rises to the level of modification requiring application of NSPS.
=== Acid Rain Program ===
The Acid Rain Program (ARP) is an emissions trading program for power plants to control the pollutants that cause acid rain. The 1990 CAA Amendments created a new title to address the issue of acid rain, and particularly nitrogen oxides (NOx) and sulfur dioxide (SO2) emissions from electric power plants powered by fossil fuels, and other industrial sources. The Acid Rain Program (ARP), established under the 1990 Clean Air Act Amendments, was the first cap-and-trade emissions program in the United States, aimed at reducing sulfur dioxide (SO2) and nitrogen oxides (NOx) emissions, the primary contributors to acid rain. The program set a national cap on total emissions of SO2 and NOx from power plants, which was gradually reduced over time. Power plants were allocated emission allowances, each allowing the release of one ton of SO2, based on historical emissions. Plants that reduced their emissions below their allowances could trade excess allowances with other plants, creating a financial incentive to invest in cleaner technologies. Continuous emissions monitoring systems were required to ensure compliance, and plants that exceeded their allowances faced fines. The program's success is evident in the 50% reduction of SO2 emissions from power plants by 2000, significantly improving air quality and reducing acid rain. The Acid Rain Program became a model for subsequent cap-and-trade systems, including those targeting greenhouse gas emissions.
=== Ozone layer protection ===
The CAA ozone program is a technology transition program intended to phase out the use of chemicals that harm the ozone layer. Consistent with the US commitments in the Montreal Protocol, CAA Title VI, added by the 1990 CAA Amendments, mandated regulations regarding the use and production of chemicals that harm Earth's stratospheric ozone layer. Ozone-depleting chemicals (ODCs) are substances that contribute to the depletion of Earth's stratospheric ozone layer, which protects life on Earth from harmful ultraviolet (UV) radiation. The primary ODCs regulated under the Clean Air Act (CAA) and the Montreal Protocol include chlorofluorocarbons (CFCs), halons, hydrochlorofluorocarbons (HCFCs), hydrofluorocarbons (HFCs), methyl chloroform, and carbon tetrachloride. CFCs were commonly used in refrigeration, air conditioning, and foam-blowing agents, while halons were used in fire extinguishing systems. HCFCs were seen as less harmful alternatives to CFCs but still contributed to ozone depletion, and they are also being phased out. Under Title VI, EPA runs programs to phase out ozone-destroying substances, track their import and export, determine exemptions for their continued use, and define practices for destroying them, maintaining and servicing equipment that uses them, identifying new alternatives to those still in use, and licensing technicians to use such chemicals.