Bronte Wells
California has long struggled with air pollution, and its efforts to improve air quality have been hampered by its unique geography, weather, and growing population, as well as industrial activities. The state's air pollution problem is multi-faceted, with vehicular emissions, industrial processes, and wildfires all playing a significant role. California's air pollution issues have been recognised since 1943, when residents first reported side effects such as irritated eyes, burning lungs, coughing, and nausea. Despite the state's efforts to implement stricter regulations and its leadership in climate change agreements, it continues to have some of the worst air quality in the nation, with more than 90% of Californians breathing unhealthy air.
| Characteristics | Values |
|---|---|
| Air pollution | Unhealthy levels of particle pollution or ozone |
| Air pollution causes | Wildfires, industrial facilities, transportation, vehicles, commercial activities, climate change, geographical conditions, weather, growing population |
| Water pollution | 1.6 million acres of California's lakes, bays, wetlands, and estuaries do not meet water quality standards |
| Air pollution health impacts | Burning lungs, irritated eyes, coughing, nausea, asthma, lung cancer, thousands of fatalities |
| Air pollution regulations | Clean Air Act, Mulford-Carrell Air Resources Act, Federal Air Quality Act, emission standards, cap-and-trade programs, Zero Emission Vehicle mandate, stricter vehicle regulations, financial incentives for electric vehicles, prescribed fires |
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California's air pollution
The state's air pollution has severe health impacts on its residents. According to the California Air Resources Board (CARB), over 90% of Californians breathe unhealthy levels of one or more air pollutants during some part of the year. CARB has identified about 200 pollutants as air toxics, with no known safe levels, and the estimated total cancer risk from these air toxics is 730 per million. A 2021 study by the Environmental Defence Fund and George Washington University found that exposure to particle pollution led to more than 3,000 deaths and nearly 5,500 new childhood asthma cases in the California Bay Area alone. Overall, air pollution is responsible for an average of 10,000 deaths per year in the state.
One of the biggest sources of harmful emissions in California is the transportation industry, which currently accounts for approximately 40% of the state's atmospheric pollution. To address this, California has adopted some of the nation's strictest regulations for vehicles, contributing to a significant decrease in emissions. Many California cities are now increasing public transportation infrastructure to target personal vehicular emissions. The state has also implemented a Zero Emission Vehicle mandate, which aims to add about 1.5 million hydrogen fuel cell vehicles to the roads by 2025.
In addition to vehicular emissions, California's air pollution is exacerbated by fossil fuel production and prolonged wildfire seasons. The state's pursuit of clean air has been challenging, with new, more rigorous standards being set for dangerous air pollutants like soot. Local and state officials are planning additional pollution-fighting measures, and California's local air quality districts must develop and approve plans to achieve emissions reductions. Despite the challenges, California has become a global leader in climate change efforts, entering agreements with several nations and linking cap-and-trade programs with Quebec.
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Water pollution
California is facing a water contamination crisis, with nearly a million residents lacking access to clean drinking water. The problem is particularly severe in low-income communities of colour, which are disproportionately affected by pollution and water scarcity. Latino farm communities, for instance, are struggling with both poverty and pollution.
The state's water rights system has been criticised as systemically racist and unequal, with communities of colour forced to truck in drinking water due to polluted or dry groundwater wells. A report by the California State Auditor lambasted state officials for their “lack of urgency" in addressing the issue, pointing to lengthy funding timelines and other problems. Indeed, it is estimated that ensuring safe and reliable drinking water for all Californians will cost around $16 billion, far exceeding the available funds.
California's water pollution is caused by both human actions and natural processes. Some contaminants, such as mercury from mining, are remnants of past activities, while others, such as pesticides, metals, pathogens, and nitrogen fertilizers, are ongoing sources of pollution. The state has implemented regulations to protect public health and the environment, including the Porter-Cologne Water Quality Control Act and the federal Clean Water and Safe Drinking Water Acts. However, enforcement and compliance remain challenging, with over 300 water systems exceeding state contamination levels.
The impact of water pollution is widespread, affecting not only drinking water but also swimming and fishing. A state study found that fish in 99% of coastal waters and 49% of freshwaters exceed safe levels for consumption, posing risks for those who depend on fishing to feed their families. Additionally, the Clean Water Act has successfully reduced pollution from industrial sources, but runoff from farms and cities has become a significant source of toxicity, respiratory diseases, and gastrointestinal illnesses.
To address these issues, California needs to invest in pollution control and wastewater management, particularly in small rural communities that lack the economic scale for effective treatment solutions. Capturing urban runoff and recycling wastewater can help reduce pollution and create new water supplies. Consolidating smaller water suppliers with larger systems can also improve access to safe drinking water.
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Climate change
California is already experiencing the impacts of climate change, with observable shifts in the frequency and severity of extreme weather events. As the state with the highest population in the US, and a global economic powerhouse, the effects of climate change on California are significant.
The warming climate is also causing more frequent and intense wildfires. Forest and rangelands cover over 80% of California's 100 million acres, and climate change will affect tree survival and growth, reducing productivity and changing habitats. Wildfire smoke leads to increased respiratory illness, and is more dangerous to human health than similar levels of pollution from other sources. Warmer temperatures also lead to the spread of mosquito-borne diseases like Zika and West Nile virus.
California's agricultural industry, which generated $39 billion in revenue in 2007 and is responsible for more than half of all domestic fruits and vegetables, is also under threat. Climate change can cause drought, saltwater contamination through rising sea levels, flooding, and increased risk of pests. These changes pose a serious threat to California's agricultural industry and the state could be impacted economically due to the rising cost of providing water to its residents, as well as revenue and job losses in the agricultural sector.
Sea-level rise is already accelerating along the California coast and will continue to rise substantially over the 21st century, threatening coastal communities, natural resources, cultural sites, and infrastructure. Coastal flooding and coastal erosion will also impact approximately 85% of California's population, who live and work in coastal counties.
California has taken a number of legislative steps and measures to combat climate change, including incentives, plans for clean cars, renewable energy, and pollution controls on industry. The state has also committed to reducing greenhouse gas emissions in line with the Paris Agreement and reaching net-zero carbon emissions by 2045.
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Wildfires
California's wildfires emit large amounts of carbon, with the 2020 fire season alone contributing 49% of the state's 2030 emissions target. The carbon emissions from these fires are equivalent to approximately $987 million in damages to California. The emissions from the wildfires also have a negative feedback loop effect, where increased CO2 in the atmosphere leads to higher temperatures, extreme heat events, droughts, and invasive species, which in turn increase the risk and intensity of future fires. This cycle further exacerbates the climate change challenges California faces.
The impact of wildfires on air quality is significant. Wildfires produce smoke and release particulate matter, such as PM2.5, into the air. These fine particles can have severe health effects, leading to increased hospital admissions and premature deaths. Modeling results indicate that wildfires can exceed PM2.5 air quality standards by up to 10 times in certain locations. The increase in PM2.5 concentrations due to wildfires is estimated to cause an additional 1,391 hospitalizations and 466 deaths.
Nitrogen oxides, which form smog, are also increasing in rural areas due to wildfires, according to a UC Davis study. The smoke from wildfires can spread across the state, affecting the air quality in various regions. California has a network of over 250 permanent air monitoring stations to track these pollutants and provide real-time data to the public.
To address the pollution caused by wildfires, California has included the wildfire threat in its 2009 Climate Adaptation Strategy. The state is working to protect forests, increase public awareness of proper land management practices, and promote efforts to maintain air quality. Additionally, California is collaborating with the federal government to better manage forests and build fire resilience. The state is also focusing on making forests and natural lands more resilient and healthy to support carbon neutrality and mitigate the impacts of wildfires on the environment.
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Impact on health
California has long struggled with air pollution, and its residents continue to face serious health consequences as a result. A 2008 economic study of the Los Angeles Basin and San Joaquin Valley found that over 3,800 people die prematurely each year due to air pollution levels that violate federal standards. The state's air quality problems are multi-faceted and have a range of sources, from vehicle emissions to agricultural practices and wildfires.
The California Air Resources Board (CARB) has identified around 200 pollutants as air toxics, including nitrogen oxides, carbon monoxide, formaldehyde, and hydrogen sulfide. These pollutants have been linked to a range of adverse health effects, including cancer, organ failure, neurological issues, and birth defects. Long-term exposure to particulate air pollution is also associated with an increased risk of mortality from heart disease and stroke, with fine particulate matter (PM2.5) being of particular concern as it can penetrate deeply into the body and has been linked to multiple mortality categories, especially cardiovascular death. Children in highly polluted areas of California face a fivefold greater risk of reduced lung function, and the state's air pollution has been estimated to cause around 730 extra cancer cases per million people.
The impact of air pollution on health is not evenly distributed across California's population. A 2021 study found that the combination of extreme heat and poor air quality disproportionately affects vulnerable communities, particularly low-income communities of colour. This disparity is due in part to the fact that poorer people often live on the outskirts of cities, where they are more exposed to emissions from industrial activities and major roadways. The study also highlighted the systematic failure of environmental regulations to protect people of colour, with California's environmental laws historically favouring white residents.
In addition to the direct health impacts of air pollution, there are also economic repercussions. The health effects of air pollution in the San Joaquin Valley, for example, have been estimated to cost the region around $3 billion annually. This includes the cost of health treatment, as well as lost work and school days due to poor air quality. The total cost of air pollution to California's economy is likely much higher, as the state has consistently ranked among the worst in the US for air quality.
While California has implemented some of the strongest environmental laws in the country, the state continues to face significant challenges in improving air quality and protecting the health of its residents. Climate change, in particular, poses an ongoing threat, with rising temperatures and increasing drought conditions contributing to more frequent and destructive wildfires, which further degrade air quality.
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Frequently asked questions
California has some of the worst air quality in the US. More than 90% of Californians live in counties with unhealthy levels of air quality. The state's wildfires, industrial facilities, and transportation are the main contributors to air pollution.
California has adopted some of the nation's strictest regulations for vehicles, which has contributed to a drastic decrease in emissions. The state is also encouraging residents to transition to electric vehicles by offering tax breaks and expanding its network of charging stations. California has also set stricter emission standards for diesel trucks, oil tankers, and other ships.
The Clean Air Act (CAA) is a federal law that aims to reduce air pollution and limit its damage to public health. It establishes emission standards and requires the maximum degree of reduction of hazardous air pollutants. The Act allows California to set more stringent air quality rules due to its unique conditions.
