Brian Barton
Los Angeles is known for its beaches, celebrities, and Hollywood movies, but in recent years, it has gained notoriety for its poor air quality. The city has some of the worst air pollution in the United States, with high levels of ozone and particulate matter (PM2.5), which have been linked to serious health issues such as heart disease, respiratory illnesses, and premature death. While there have been efforts to improve air quality, such as the Clean Air Act and sustainability plans, Los Angeles continues to struggle with pollution from various sources, including transportation, shipping, and industrial activities. The unique geographical features of the region, including its warm climate and mountain ranges, also contribute to the trapping of pollution. As a result, Los Angeles has received a failing grade for air quality in national reports, and the health of its residents is at risk.
| Characteristics | Values |
|---|---|
| Population | 4 million in LA, with another 6 million in the surrounding county |
| Vehicles | 6.5 million vehicles in the city of LA alone |
| Shipping Industry | The Port of Los Angeles and the Port of Long Beach are the two busiest container ports in the US |
| Geography | The Los Angeles Basin is a dip in the Earth's surface that traps ozone pollution |
| Climate | The warm, sunny climate cooks emissions into smog |
| Mountain Ranges | The mountains trap pollution in place |
| Wildfires | Severe heatwaves and wildfires contribute to worsening air pollution |
| Power Consumption | Power consumption and personal local emissions are a major source of air pollution |
| Progress | LA's air quality has improved by 10.6% from 2017 to 2018, and 11.8% from 2018 to 2019 |
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What You'll Learn
Los Angeles's worsening air pollution
Los Angeles, California, is known for its beaches, celebrities, and Hollywood movies. However, in recent years, it has gained an infamous reputation for its poor air quality. The city's worsening air pollution has led to severe climate issues and negative health impacts on residents.
According to the 2019 State of the Air report, Los Angeles has the worst ozone air pollution in the United States. The city's unique basin-like geographical structure, with its dip in the Earth's surface, traps the harmful ground-level ozone pollution, causing serious health issues. This "bad" ozone is man-made and distinct from the "good" ozone layer high in the atmosphere that protects the Earth from UV radiation. The trapped ozone, coupled with high temperatures and drier conditions, has resulted in severe wildfires, further exacerbating air pollution.
Vehicle emissions and heavy traffic congestion significantly contribute to Los Angeles's poor air quality. As the third most economically powerful city globally, Los Angeles has a large population of approximately 4 million residents, with another 6 million in the surrounding county. The city's shipping industry is a critical component of its economic structure, with the Port of Los Angeles and the Port of Long Beach being the busiest container ports in the country. Nearly 40% of US imports pass through the LA area, primarily transported by fossil-fuelled vehicles that release toxic particles into the atmosphere. The increase in cargo imports and supply chain disruptions have led to more vessels running on polluting auxiliary engines, further worsening air quality.
In addition to vehicle emissions, severe heat waves, and wildfires, Los Angeles's air pollution is also impacted by its industrial activities. The two ports in LA, which fall under federal jurisdiction, are the largest fixed sources of smog-forming emissions in the basin. While efforts to reduce emissions from in-state vehicles have shown some progress, emissions from aircraft, locomotives, and oceangoing vessels continue to increase.
The health implications of Los Angeles's poor air quality are evident. Breathing in particle pollution has been linked to respiratory illnesses, heart attacks, strokes, and even premature death. According to the American Lung Association, 98% of Californians live in areas with unhealthy levels of smog or fine particles. Assemblymember Eloise Gómez Reyes highlighted the impact on children, stating that in Southern California, over 200,000 children suffer from asthma, with about 60,000 of them residing in areas with the worst ozone pollution.
While there have been improvements in air quality during the early weeks of the COVID-19 pandemic due to reduced transportation and lockdowns, the underlying issues contributing to Los Angeles's air pollution persist. Without further action, the city's air quality will continue to deteriorate, posing a constant threat to the health and well-being of its residents.
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The impact of the shipping industry
The shipping industry has had a significant impact on Los Angeles, particularly in terms of air pollution and the resulting health risks for residents. The Ports of Los Angeles and Long Beach are the busiest container ports in the United States, handling about 40% of the country's imports. This high volume of shipping activity has made these ports the region's largest source of pollution, with docked ships set to become the biggest source of smog-forming pollution in Southern California.
The huge consumption of fuel oil by ships has resulted in far more pollutant emissions than predicted. In 2017, the shipping market consumed approximately 3.8 million barrels of crude oil per day. The emissions from idling ships waiting to dock have substantial implications for portside communities, as they emit pollutants in close proximity to residents. In one zip code near the California ports, the risk of cancer from air toxics is higher than in 99% of the surrounding region, with similar health risks seen in communities farther from the ports as well.
While there have been efforts to reduce emissions, such as the Alternative Maritime Power® (AMP®) program, which aims to reduce emissions from docked container vessels, and the Vessel Speed Reduction Program (VSRP), which encourages slower speeds near the port, the shipping industry has often fought against tougher rules due to the associated costs. Additionally, port leaders have shown a lack of urgency in addressing the issue, with voluntary agreements to reduce emissions often going unfulfilled.
The Port of Los Angeles has set goals to reduce GHG emissions by 40% below 1990 levels by 2030 and by 80% by 2050. They are investing in zero-emissions equipment and vehicles, as well as incentivizing the use of zero-emissions trucks through their Clean Truck Program. While these advancements toward cleaner shipping are promising, the global shipping industry is still on track to increase its greenhouse gas emissions by 20% by 2050 if additional interventions are not made.
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The role of geography in trapping pollution
Los Angeles, the largest city in California, is known for its beaches, celebrities, and Hollywood movies. However, in recent years, it has gained notoriety for its poor air quality, becoming one of the most polluted regions in the nation. The unique geography of LA plays a significant role in trapping pollution, exacerbating the problem.
LA is situated in a basin, a dip in the Earth's surface resembling a bowl. This basin effect traps ozone pollution, preventing it from dispersing. The ""bad"" ozone, a man-made pollutant at ground level, poses severe health risks to residents, causing coughing, wheezing, asthma attacks, and even contributing to heart attacks and premature death. The basin topography ensures that this harmful ozone remains concentrated in the area, impacting the climate and public health.
Surrounding mountains further contribute to trapping air pollution in LA. The city is encircled by a ring of mountains, including the San Gabriel Mountains, which act as barriers to the movement of air. While strong winds can blow emissions out through the narrow passages between these mountains, stagnant air often traps pollutants in the basin. This phenomenon is known as a marine inversion, where warm air from inland LA traps cooler ocean air, hindering the dispersal of pollution.
The combination of the basin and the encircling mountains creates an ideal environment for pollution buildup. The natural geography of the region, coupled with high traffic density and a thriving shipping industry, results in a challenging situation for air quality management. The large population of 4 million in LA, with an additional 6 million in the surrounding county, contributes significantly to the city's ""non-attainment"" air quality status.
Additionally, the climate crisis contributes to worsening air pollution in LA. Severe heatwaves and extreme wildfires fuel each other in a vicious cycle. The burning of fossil fuels traps heat energy, raising temperatures and creating conditions that intensify wildfires. These wildfires, in turn, release massive amounts of smoke and pollutants into the atmosphere, further degrading air quality.
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Health consequences of air pollution
Los Angeles, the largest city in California, is known for its entertainment businesses, Hollywood, and its position as the heart of the American film industry. However, it has also gained a reputation for its poor air quality, receiving an 'F' grade for air quality in a national report. The city's worsening air pollution has had detrimental effects on the health of its residents.
The health consequences of air pollution are varied and severe. Air pollution is a mix of hazardous substances from human-made and natural sources, including vehicle emissions, fuel oils, natural gas, and by-products of manufacturing and power generation. These pollutants form smog, which is trapped in the Los Angeles Basin, a dip in the Earth's surface. This "bad" ozone, as opposed to the "good" ozone layer high in the atmosphere, is extremely harmful to humans.
The fine particulate matter (PM 2.5) in air pollution can be inhaled deeply into lung tissue, causing serious health problems. These include respiratory infections, asthma, cardiac problems, and lung cancer. The oxidative stress and inflammation caused by air pollution exposure can also lay the foundation for chronic diseases and cancer. In fact, the International Agency for Research on Cancer of the World Health Organization (WHO) has classified air pollution as a human carcinogen.
The health effects of air pollution disproportionately impact certain groups. For example, children are more susceptible to harm from air pollution due to their developing lungs and higher inhalation rates relative to their size. They also tend to spend more time outdoors, exposing them to more polluted air. Additionally, people living in poverty are at increased risk as they are more likely to reside near pollution sources and have limited resources to relocate. Furthermore, older adults are more vulnerable to the adverse effects of air pollution, as their lung function naturally diminishes with age, and they are more likely to have pre-existing chronic conditions.
The impact of air pollution on health is not limited to physical ailments. There is evidence that air pollution contributes to psychosocial distress and chronic stress, particularly in low-income communities. Moreover, it increases the risk of neurological conditions such as cognitive impairment and dementia.
The health consequences of air pollution in Los Angeles highlight the urgency of implementing effective measures to reduce pollution levels and protect public health.
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Efforts to improve air quality
Despite improvements in recent decades, Los Angeles County remains one of the most polluted regions in the nation. Outdoor air pollutants have been linked to respiratory symptoms, coughing, breathing difficulties, chronic bronchitis, and increased risk of heart attacks. To combat this, Los Angeles has implemented several initiatives to improve air quality and protect public health.
One significant effort is the shift towards electric vehicles (EVs). The Los Angeles County Metropolitan Transportation Authority (Metro) has taken steps to improve air quality by using more fuel-efficient vehicles and adopting renewable energy sources. Metro is home to the nation's largest fleet of compressed natural gas (CNG) buses, and its Orange Line bus rapid transit is going fully electric by 2020. The entire Metro bus fleet will be electric by 2030.
In addition to Metro's efforts, BREATHE California of Los Angeles County has launched the "End Diesel Now" campaign, calling for the elimination of diesel trucks at the Ports of Los Angeles and Long Beach. This campaign aims to reduce air pollution and improve public health by targeting one of the biggest sources of pollution in the county.
Los Angeles Mayor Eric Garcetti has also developed a Zero Emissions 2028 Roadmap, seeking to accelerate the transition to electric vehicles for privately-owned cars and trucks. This initiative is particularly important as motor vehicles represent the leading source of city-wide PM2.5 and nitrogen dioxide, which are harmful pollutants.
Furthermore, increasing the percentage of the power grid that relies on renewable energy will be a critical step in improving air quality. While air pollution levels in Los Angeles still exceed federal standards, there is optimism for the future with the combination of long-standing trends of improving air quality, new legislation, and shifts in purchasing behavior.
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Frequently asked questions
The main causes of air pollution in Los Angeles are vehicle emissions, industrial facilities, wildfires, and the shipping industry.
Air pollution in Los Angeles has been linked to respiratory and heart problems, including coughing, breathing difficulties, chronic bronchitis, and an increased risk of heart attacks and premature death.
Various initiatives are being implemented to improve air quality in Los Angeles, including the "Clean up Green up" campaign targeting low-income communities, the San Pedro Bay Ports Clean Air Action Plan, and the current mayor's sustainability plan to increase zero-emission vehicles.
Los Angeles faces challenges in improving its air quality due to its warm, sunny climate that contributes to the formation of smog, and the presence of expansive mountain ranges that trap pollution. Additionally, the city's high traffic density and the impact of the shipping industry on port cities contribute to persistent air quality issues.
