Greta Jimenez
California has historically had some of the worst air quality in the United States, with more than 90% of Californians living in counties with unhealthy levels of air quality. However, in recent years, the state has made significant strides in improving air quality, particularly through the implementation of aggressive emissions policies and regulations. Despite these improvements, racial and socioeconomic disparities persist, with low-income communities of color continuing to be disproportionately affected by air pollution. While the state has successfully reduced residents' exposure to PM2.5 pollution from vehicles, commercial activities, such as agriculture and cargo operations, continue to contribute significantly to air pollution in California.
| Characteristics | Values |
|---|---|
| Air quality in California | Unhealthy levels of air quality |
| Contaminants | Wildfires, industrial facilities, transportation, vehicles, diesel engines, ports, motor vehicles, industries, commercial activities, fossil fuel production, climate change, ships, trucks, locomotives, aircraft, agriculture |
| Air toxics | 200 pollutants identified by CARB |
| Cancer risk from air toxics | 730 per million |
| Cancer risk from diesel particulate matter | 520 per million |
| Air pollution-related deaths in California | More than 5,000 premature deaths each year |
| Air pollution-related childhood asthma cases in California | Nearly 5,500 new cases each year |
| Air pollution-related deaths due to nitrogen dioxide | More than 2,500 each year |
| Total air pollution-related deaths | 10,000 each year |
| Reduction in residents' exposure to PM2.5 pollution | 65% since 2000 |
| Number of charging stations for electric vehicles | 35,000 |
| Percentage of vehicle sales that were electric vehicles in 2021 | 12.4% |
| Number of counties with unhealthy levels of soot | 29 |
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What You'll Learn
California's air pollution sources
California has made significant strides in improving its air quality, with residents today breathing much cleaner air compared to 25 years ago. However, air pollution remains a pressing issue, with over 90% of Californians exposed to unhealthy levels of air pollutants each year. The state has identified numerous sources of air pollution, which can be broadly categorised into mobile, stationary, and area-wide sources.
Mobile sources include on-road vehicles such as automobiles, light-duty cars, and trucks, as well as off-road vehicles like trains, ships, aircraft, and agricultural equipment. These vehicles contribute to air pollution through the combustion of fuels such as gasoline, oil, and diesel, as well as through emissions of volatile organic compounds (VOCs) and nitrogen oxides (NOx). The state has implemented aggressive emissions policies and vehicle emission control programs to target this source of pollution, and has seen a 65% reduction in PM2.5 pollution from cars, trucks, and other vehicles since 2000.
Stationary sources refer to approximately 13,000 individual facilities, known as point sources. These include electric power plants, refineries, smelters (metal refineries), waste incinerators, and battery manufacturing facilities. The combustion of leaded gasoline in piston engine aircraft and emissions from industrial manufacturing processes also contribute to air pollution.
Area-wide sources encompass approximately 80 source categories, mainly linked to human activity. This includes consumer products, architectural coatings, and agricultural practices. Agriculture is the largest contributor to air pollution in California's valleys, accounting for 35% of the pollution in these regions. Wildfires are another significant source of air pollution in California, with the state's dry and sunny climate contributing to high ozone levels.
To address these issues, California has implemented various programs and policies. The California Air Resources Board (CARB) has established health-based ambient air quality standards and identified toxic air contaminants (TACs) that may cause serious long-term health effects. The state has also prioritised reducing diesel emissions from ships, trucks, and locomotives through the Diesel Emissions Reduction Act (DERA) grant program. Despite these efforts, racial and socioeconomic disparities persist, with low-income communities of colour continuing to experience higher levels of air pollution.
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The state's emissions policies
California has implemented a range of aggressive emissions policies that have significantly improved the state's air quality. Notably, the state enacted the nation's first vehicle emissions standards in 1966, demonstrating its early commitment to addressing air pollution.
One of the key policies is the Diesel Emissions Reduction Act (DERA), a grant program administered by the Environmental Protection Agency (EPA). The DERA program aims to reduce diesel emissions from ships, trucks, locomotives, and other diesel engines. Since its implementation in 2005, the program has achieved impressive outcomes in improving California's air quality.
The California Air Resources Board (CARB) has also played a crucial role in establishing health-based ambient air quality standards. CARB has set standards for traditional pollutants like ozone and particulate matter, as well as identifying toxic air contaminants (TACs) that may cause serious long-term health effects, such as cancer. CARB works closely with local air pollution control districts to reduce air pollution from all sources, including vehicles, power plants, and industrial manufacturing.
California has also introduced the Truck and Bus Regulation, targeting emissions from heavy-duty diesel vehicles, and the Zero-Emission Vehicle Program, mandating that all new vehicles in California be zero-emission by 2035. These policies have significantly reduced residents' exposure to PM2.5 pollution, which is linked to various adverse health effects and premature deaths.
Additionally, California has sought waivers from the EPA to enforce stricter air emission standards for cars and trucks. These waivers require new passenger car sales for the model year 2026 to be 35% zero-emission and eliminate the sale of gasoline vehicles by 2035. However, there have been recent efforts by the EPA to overturn these waivers, which could impact not only California but also other states that have adopted similar regulations.
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Air quality improvements
California has made significant strides in improving its air quality over the past two decades, particularly through the implementation of aggressive emissions policies. According to a 2024 study published in Science Advances, California's emissions policies have successfully reduced residents' exposure to PM2.5 pollution—fine particulate matter in the air—from cars, trucks, and other vehicles by 65% since 2000. This is a remarkable achievement, as fine particulate matter air pollution is linked to various adverse health effects, causing an estimated 5,000 premature deaths in California annually.
The California Air Resources Board (CARB) has played a pivotal role in improving air quality. They have established health-based ambient air quality standards to define safe levels of outdoor pollutants, including traditional pollutants like ozone and particulate matter, and toxic air contaminants (TACs) that can cause serious long-term health issues even at low levels. CARB has identified about 200 pollutants as air toxics and works closely with local air pollution control districts to reduce emissions.
California has also been a leader in vehicle emissions standards, enacting the nation's first such standards in 1966, four years before the federal Clean Air Act. Recent initiatives include the Truck and Bus Regulation, targeting heavy-duty diesel vehicles, and the Zero-Emission Vehicle Program, mandating that all new vehicles in California be zero-emission by 2035. These efforts have been effective, with studies showing that California has successfully reduced pollution from on-road emission sources, including cars, light-duty trucks, and heavy-duty vehicles.
Additionally, California has addressed air pollution from commercial activities, which contribute significantly to the state's economy but also account for half of its air pollution. In 2020, stricter emission standards were adopted for diesel trucks, oil tankers, and other ships, aiming to eliminate 10,000 tons of emissions annually. The state is also encouraging the transition to electric vehicles (EVs) through tax breaks and expanding its network of charging stations. As a result, in 2021, EVs represented 12.4% of all vehicle sales, showcasing California's leadership in the US market.
While California's air quality has improved, it is important to acknowledge that racial disparities persist. Despite reductions in PM2.5 pollution, low-income communities of color continue to experience higher levels of air pollution. Historically, racist housing policies have forced communities of color to reside closer to highways and ports, resulting in higher exposure to vehicle pollution. While California has effectively tackled on-road emissions, addressing these underlying disparities and ensuring equal access to clean air for all remains a key challenge.
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Health impacts of pollution
While California has made significant strides in improving its air quality, with residents breathing much cleaner air than they did 25 years ago, the state continues to face pressing health concerns stemming from pollution. Over 90% of Californians are exposed to unhealthy levels of air pollutants at some point during the year. The sources of these pollutants vary and include industrial processes, transportation, wildfires, and agricultural activities. The state's diverse topography, from its large basin in Los Angeles to its mountain ranges, also contributes to the concentration of certain pollutants.
One of the primary health impacts of pollution in California is respiratory issues. Ozone pollution, particularly prevalent in Los Angeles, can cause respiratory harm. The state's aggressive emissions policies have helped reduce residents' exposure to PM2.5, or fine particulate matter, which is linked to increased rates of asthma and other respiratory conditions. The San Joaquin Valley, a major agricultural hub, experiences poor air quality due to agricultural contributions and has high rates of asthma among its residents. Wildfire pollutants, often invisible, can also have detrimental respiratory effects on vulnerable populations.
In addition to respiratory problems, pollution in California has been associated with cardiovascular disease and other health conditions. Diesel emissions, particularly from older engines, have elevated levels of particulate matter (PM2.5) and nitrogen oxides (NOx), which are linked to these health issues. Low-income communities and communities of color are disproportionately affected by these pollutants, as they are often located closer to major transportation corridors and industrial activities. The combination of extreme heat and poor air quality further exacerbates the health risks for these vulnerable communities.
The health impacts of pollution in California extend beyond physical ailments. The state's environmental regulations have been criticized for systematically favoring white residents over people of color. The economic repercussions of pollution are also significant, with the San Joaquin Valley losing an estimated $3 billion annually due to health-related costs associated with air pollution.
To address these health impacts, California has implemented various measures. The state enacted vehicle emissions standards as early as 1966 and continues to lead the nation in air quality policy. The California Air Resources Board (CARB) establishes health-based ambient air quality standards and identifies toxic air contaminants (TACs) that may cause serious long-term effects, such as cancer. The Diesel Emissions Reduction Act (DERA), administered by the Environmental Protection Agency (EPA), aims to reduce emissions from older diesel engines. These efforts reflect California's ongoing commitment to mitigating the health consequences of pollution and improving the well-being of its residents.
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Racial disparities in air quality
California has made significant strides in improving its air quality, with residents breathing much cleaner air today compared to 25 years ago. The state's aggressive emissions policies have played a pivotal role in this progress, reducing exposure to PM2.5 air pollution—fine particulate matter—by an impressive 65% since 2000. This success encompasses a wide range of sources, including cars, trucks, and other vehicles.
However, despite these remarkable achievements, California continues to grapple with persistent racial disparities in air quality. Low-income communities of color, particularly Black and Latino communities, still endure the most polluted air in the state. This issue is deeply rooted in historical racism and discriminatory practices such as housing policies and highway relocation, which have forced communities of color to reside closer to highways, ports, and high-pollution sources. As a result, these communities have been disproportionately exposed to higher levels of air pollution.
While California's efforts to curb emissions from vehicles have led to substantial reductions in air pollution, the relative disparities remain. Targeting vehicle emissions alone is insufficient to bridge the air quality gap. Even with the widespread adoption of electric vehicles, other vehicle components like tires and brakes will continue to emit pollutants. Additionally, the concentration of diesel emissions in certain areas has contributed to elevated levels of harmful pollutants, disproportionately affecting low-income and Latino residents.
To effectively address these disparities, systemic factors must be addressed, such as shifting the locations where emissions occur. Strategies that accelerate the transition to zero-emission vehicles and target emissions reductions in historically overburdened areas, such as near ports and rail yards, can significantly reduce relative PM2.5 exposure disparities. Furthermore, educational interventions in socioeconomically and ethnically diverse communities can empower residents to mitigate their exposure to outdoor environmental asthma triggers, thereby improving their quality of life.
While California has made remarkable progress in improving overall air quality, closing the racial gap in air quality exposure remains a critical and ongoing challenge. Addressing this issue requires a comprehensive approach that targets systemic inequalities and prioritizes the well-being of communities of color.
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Frequently asked questions
California has improved its air quality dramatically, with residents breathing 65% less PM2.5 pollution from cars, trucks, and other vehicles since 2000. However, racial disparities persist, with low-income communities of color still experiencing the worst air quality.
The transportation industry is one of the biggest sources of harmful emissions in California, contributing about 40% of the state's atmospheric pollution. Commercial activities, such as the Port of Los Angeles and the state's 12 major cargo airports, are responsible for a third of the state's economy and half of its air pollution. Wildfires, industrial facilities, and agricultural activities also contribute significantly to air pollution in California.
Air pollution in California has been linked to thousands of premature deaths, new cases of childhood asthma, and increased rates of asthma and cardiovascular disease. Fine particulate matter air pollution, or PM2.5, has been estimated to cause over 5,000 premature deaths in the state each year. Overall, air pollution is responsible for an average of 10,000 deaths in California annually.
California has enacted aggressive emissions policies and has the nation's first vehicle emissions standards, established in 1966. The state has also implemented the Truck and Bus Regulation, targeting heavy-duty diesel vehicles, and the Zero-Emission Vehicle Program, requiring all new vehicles to be zero-emission by 2035. California cities are also increasing public transportation infrastructure and incentivizing the transition to electric vehicles.
While California has made significant improvements, certain communities continue to be disproportionately affected by air pollution. Low-income communities of color and Hispanic and Black Californians have been exposed to the highest levels of vehicle pollution due to racist housing policies and proximity to highways and ports. Additionally, the San Joaquin Valley, with its unique geographical challenges, continues to struggle with poor air quality and high rates of asthma.
