Cecily Zamora
California has long been at the forefront of air quality research and vehicle emissions standards, with the state's severe air pollution problems driving the need for innovation. Due to these unique circumstances, California has been granted special legal authority to set its own vehicle emissions standards, which are often stricter than federal regulations. This authority is derived from the Clean Air Act, which allows California to seek waivers from the Environmental Protection Agency (EPA) to enforce its own standards. The EPA is required to grant these waivers as long as California's standards are at least as protective of public health and welfare as federal law, and are necessary to address the state's compelling and extraordinary conditions. This process has resulted in a pattern of iterative federalism, where California pioneers new regulations that are later adopted by federal regulators.
| Characteristics | Values |
|---|---|
| California can set its own vehicle emission laws because it has | severe air pollution problems |
| unique air pollution problems | |
| a pre-existing program | |
| a large number of cars on the road | |
| a history of pioneering air quality research | |
| a large population | |
| a history of developing innovative laws and standards | |
| a history of receiving waivers from the EPA | |
| a history of setting stricter standards than federal standards | |
| a history of other states adopting its standards | |
| a history of successful demonstrations of its standards | |
| a history of waivers granted by the federal government |
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What You'll Learn
California's Clean Air Act exemption
California has been at the forefront of vehicle emissions control technology since 1961, when its Motor Vehicle Pollution Control Board issued regulations mandating the use of the nation's first vehicle emissions control technology. In 1966, California developed the country's first vehicle emissions standards, which were later adopted by the EPA for model year 1968 cars.
Due to its history of innovation in this field, California was granted an exemption from the Clean Air Act, which prohibits states from enacting their own emission standards for new motor vehicles. This exemption allows California to seek a waiver from the EPA to set its own vehicle emission regulations, as long as they are at least as strict as federal law and necessary to address the state's unique air pollution problems.
California has received numerous waivers over the years as it has worked to reduce vehicle emissions by enacting increasingly stringent standards. The state's current efforts include phasing out the sale of new fossil fuel-powered lawnmowers, large trucks that transport goods through ports, and diesel-powered trains. California is also seeking a waiver from the federal government to ban the sale of all new gas-powered cars by 2035.
Other states cannot set their own standards but can choose to follow California's motor vehicle emission regulations if approved by the federal government. As of 2025, 12 states and the District of Columbia have adopted California's standards.
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The state's air pollution problems
California has long struggled with air pollution. The state's large population of nearly 40 million people, significant port industry, and growing economy create significant emissions from traffic, diesel trucks, construction, agriculture, and domestic sources. California's geographical features, such as its coastal mountain ranges, also contribute to its air pollution problems. Westerly sea breezes can trap emissions blown inland, causing them to accumulate in the coastal valleys. The state's warm climate further exacerbates the issue by forming ozone and other pollutants.
Children's health is also adversely affected by air pollution. Studies have shown that high levels of air pollution are associated with an increased number of asthma cases and exacerbations in children. School absences due to acute respiratory illnesses have also been linked to rises in ozone levels in student communities. Furthermore, a 2008 economic study of the Los Angeles Basin and San Joaquin Valley in Southern California found that more than 3,800 people die prematurely each year due to air pollution levels violating federal standards. This number is significantly higher than the average number of fatalities related to auto collisions in the same area, which is fewer than 2,000 per year.
California's air pollution problems are not limited to a single city or region. The American Lung Association's "State of the Air 2019" report listed several California cities among those with the worst air pollution in the country. Bakersfield, Fresno-Madera-Hanford, Visalia, Los Angeles-Long Beach, and San Jose-San Francisco-Oakland were the top five cities with the worst annual PM2.5 levels. These cities also ranked high in ozone pollution, along with Sacramento-Roseville.
In recent years, wildfires have become an increasingly severe natural source of air pollution in California. The wildfire season of 2020 caused some of the most severe wildfires in recent years, pushing pollution levels far above typical local ranges. Cities from Los Angeles to San Francisco experienced numerous days of sustained unhealthy air quality. Climate change is expected to further aggravate the intensity of wildfires, creating warmer and drier conditions that will likely worsen California's air quality levels.
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California's pioneering of air quality research
California has long struggled with air pollution. The first recognised episodes of 'smog' occurred in Los Angeles in 1943, causing burning eyes and lungs, and nausea. In 1947, the Los Angeles County Air Pollution Control District was formed—the first such body in the US. In 1950, Arie Haagen-Smit discovered the nature and causes of photochemical smog, finding that two chief constituents of automobile exhaust—airborne hydrocarbons from gasoline and oxides of nitrogen (NOx) produced by internal combustion engines—were to blame. His research became the foundation of today's air pollution regulations.
California's severe air pollution problems have made it a pioneer in air quality research. The state began to take action, forming a Bureau of Air Sanitation within the California Department of Public Health, requiring that department to establish air quality standards and set controls on motor vehicle emissions of air pollutants. The Motor Vehicle Pollution Control Board (MVPCB), established by California, issued regulations mandating the use of the nation's first vehicle emissions control technology in 1961. The MVPCB was later renamed the California Air Resources Board (CARB). In 1962, the Air District's air monitoring network was established, with six stations measuring concentrations of pollutants in the air. In 1965, the Advisory Council began its pioneering work on what would become Regulation 3, limiting industrial emissions of organic compounds.
In 1966, the EPA adopted standards identical to California's for model year 1968 cars. In 1967, the Federal Air Quality Act was enacted, giving California the ability to set its own more stringent air quality rules due to its unique geography, weather, and expanding number of people and vehicles. That same year, CARB was established and Gov. Ronald Reagan signed legislation to address the state's air pollution. Under that authority, CARB adopted the nation's first NOx emissions standards for motor vehicles in 1971, leading the way to the development of the catalytic converter, which revolutionised the ability to reduce smog-forming emissions from cars. In 1975, CARB adopted new emission standards for 1977-model automobiles and 1978-model motorcycles.
Since its formation, CARB has worked with the public, the business sector, and local governments to find solutions to California's air quality problems. Some of the innovative vehicle emission control strategies that have led to cleaner air in California include: The nation's first tailpipe emissions standards for hydrocarbons and carbon monoxide (1966), oxides of nitrogen (1971), and particulate matter from diesel-fueled vehicles (1982); Zero-emission vehicle (ZEV) regulation (1990) that requires manufacturers to produce an increasing number of ZEVs; The nation’s first greenhouse gas emissions standards for cars.
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The state's ability to enforce its own standards
California's ability to enforce its own emissions standards stems from the Clean Air Act, which allows the state to seek a waiver of preemption and set its own vehicle emission regulations. This waiver process is administered by the Environmental Protection Agency (EPA), which reviews California's requested standards and determines if they meet specific criteria.
The Clean Air Act, passed in 1967, included a provision specific to California, recognising the state's unique air pollution problems and its history of developing innovative laws and standards to address them. The Act allows California to seek a waiver from the EPA to enforce its own standards, as long as they are at least as protective of public health and welfare as federal standards and are necessary to meet "compelling and extraordinary conditions".
California has successfully obtained numerous waivers over the decades, allowing it to set stricter vehicle emission standards than those mandated at the federal level. The state's severe air pollution, particularly in the Los Angeles metropolitan area, has driven its pioneering efforts in air quality research and the development of stringent emission standards.
The waiver process involves California submitting a request to the EPA, which then publishes the proposed standards for public hearing and written comment. After the comment period, the EPA reviews the comments and determines whether California's requirements for obtaining a waiver have been met. If the EPA concludes that California's standards are not arbitrary or capricious and are necessary to address the state's unique challenges, it grants the waiver.
California's ability to enforce its own standards has faced legal challenges, most notably in 2019 when the Trump administration revoked the state's authority. However, this decision was later reversed by the Biden administration, restoring California's ability to set its own standards. The state's unique legal authority in this regard has been a contentious issue, with some arguing that it violates the US Constitution and infringes upon federal government authority.
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The EPA's role in granting waivers
The Environmental Protection Agency (EPA) has played a significant role in granting California waivers to set its own emission laws. The Clean Air Act (CAA) allows California to seek waivers to enforce its own emission standards for vehicles, despite the preemption that prohibits states from doing so.
When California files a waiver request, the EPA publishes a notice for a public hearing and written comments in the Federal Register. After the comment period, the EPA reviews the comments and determines if the requirements for obtaining a waiver have been met. The EPA is mandated to grant a waiver unless it finds that California's standards are "arbitrary and capricious" and not protective of public health and welfare when compared to federal standards. California's standards must also be necessary to address "compelling and extraordinary conditions".
Since the passage of the CAA in 1967, California has received numerous waivers, allowing it to set stricter emission standards. This has resulted in a pattern where California innovates, and federal regulators follow its demonstrated success, a process known as "iterative federalism". California's severe air pollution problems have made it a pioneer in air quality research, and its efforts to reduce vehicle emissions have been ongoing since the 1960s.
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Frequently asked questions
California has unique provisions under the Clean Air Act that allow it to set its own vehicle emissions standards. This is due to the state's long history of air pollution problems and its pioneering efforts in air quality research.
The Clean Air Act allows California to seek a waiver from the Environmental Protection Agency (EPA) to enforce its own standards. This waiver is granted as long as California's standards protect public health and welfare at least as effectively as federal law and are necessary to address the state's severe air pollution issues.
Yes, the Clean Air Act also allows other states to adopt California's vehicle emissions standards without needing EPA approval. Currently, 12 states and the District of Columbia have adopted California's stricter emissions regulations.
