Brian Barton
San Diego, California, is known for its pleasant climate and outdoor activities. However, the city has faced challenges with pollution, particularly from the Tijuana River, which has been a persistent issue for decades. The river discharges wastewater, including sewage, industrial waste, and runoff, into the Pacific Ocean, impacting the region's coastal environments and public health. While the air quality in San Diego is generally considered satisfactory, with carbon monoxide levels well below the recommended guidelines, there are concerns about the impact of pollution on sensitive groups. The Tijuana River pollution has led to beach closures and potential health risks for residents, with some reporting respiratory issues, insomnia, and headaches. Studies have found that pollutants from the river can become aerosolized and transmitted through the atmosphere, affecting the air quality in nearby communities. Addressing this complex issue requires cross-border collaboration, improved infrastructure, and increased public awareness to protect the environment and the health of those living in the region.
| Characteristics | Values |
|---|---|
| Main pollutant | PM2.5 |
| PM2.5 concentration | 2.7 times the World Health Organization annual PM2.5 guideline value |
| Carbon monoxide (CO) level | 134.2x below the recommended WHO guideline of 3490 ppb |
| Source of coastal pollution | Tijuana River |
| Air quality | Satisfactory, poses little or no risk |
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What You'll Learn
Tijuana River pollution
The Tijuana River has been at the heart of a transboundary pollution crisis on the US-Mexico border for decades, causing public health issues, beach closures, and significant environmental degradation of the Tijuana River Estuary and coastal marine areas from Tijuana to Coronado.
The river flows from Baja California in Mexico into the United States, discharging millions of gallons of wastewater, sewage, industrial waste, and runoff into the Pacific Ocean every day. This makes it the primary source of coastal pollution in the region. The pollution has been an ongoing issue for over 50 years, and despite pledges to fix the problem, little progress has been made by the US and Mexican governments.
The crisis has been exacerbated by Tijuana's rapid population growth, immigration pressures at the border, and the deterioration of the US treatment plant responsible for treating much of the sewage. Since October 2023, 31 billion gallons of raw sewage, polluted stormwater, and trash have flowed into the Tijuana River Valley and the Pacific Ocean, leading to beach closures in San Diego.
The discharge of untreated sewage containing high levels of fecal bacteria has resulted in frequent beach closures, posing health risks from contaminated waters and impacting marine life and habitats. Imperial Beach, the South County community closest to the border and the Tijuana River, has had its public beaches closed for over 1,000 days, affecting the local economy and the rights of residents to safely enjoy public resources.
The Tijuana River Estuary, recognised as a "Wetland of Global Importance" by the UN's Ramsar Convention, has suffered severe degradation from decades of sewage, chemicals, trash, and sediment dumping. This has led to the filling in of coastal marsh habitats, threatening the hundreds of terrestrial and marine species that call the estuary home.
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Air pollution above WHO guidelines
San Diego's air quality is generally considered satisfactory, posing little to no risk to the public. However, the air pollution levels in the region have been recorded at 2.7 times the World Health Organization's (WHO) annual PM2.5 guideline value. PM2.5 refers to fine particulate matter, which is a mixture of solid particles and liquid droplets present in the air. Sources of PM2.5 pollutants include traffic emissions, industrial activities, and natural sources such as dust.
While the air quality may be acceptable for most individuals, sensitive groups may experience symptoms with prolonged exposure. These symptoms can include difficulty breathing and throat irritation. It is recommended that those experiencing such symptoms reduce the time spent outdoors.
One significant contributor to air pollution in San Diego is the Tijuana River, which flows from Baja California into the United States. The river discharges millions of gallons of wastewater, including sewage, industrial waste, and runoff, into the Pacific Ocean every day. This has been identified as the dominant source of coastal pollution in the region. The wastewater pollution from the Tijuana River has been an ongoing issue for decades and has severe environmental implications.
A study conducted by the University of California, San Diego, revealed that pollutants from the wastewater, such as illicit drugs, drug metabolites, and chemicals from tires and personal care products, can become aerosolized and transmitted in the atmosphere. These aerosols can then be inhaled by residents of coastal communities, potentially leading to respiratory issues and other health concerns. The study emphasizes the need for improved infrastructure, increased public awareness, and cross-border collaboration to address the sewage crisis effectively.
While the carbon monoxide (CO) levels in San Diego are currently well below the recommended WHO guideline, it is important to recognize that CO emissions contribute to climate change by influencing global and climate changes in the atmosphere. Overall, while San Diego's air quality may be considered generally acceptable, there are specific areas of concern, particularly regarding the impact of the Tijuana River and the elevated PM2.5 levels, which exceed WHO guidelines. These issues highlight the need for continued monitoring and efforts to improve air quality in the region.
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Sewage and wastewater runoff
The issue of sewage and wastewater runoff in the Tijuana River has been ongoing for decades, and it was identified as America's second most endangered river by American Rivers, an environmental non-profit organisation. A study by the University of California, San Diego, revealed that pollutants from wastewater, such as illicit drugs, drug metabolites, and chemicals from tires and personal care products, can become aerosolized and transmitted through coastal aerosols. These pollutants are then inhaled by residents of coastal communities, potentially leading to respiratory illness, insomnia, and headaches.
The impact of wastewater pollution is not limited to the Tijuana River region. Other sources of wastewater and pollution runoff in Southern California include wastewater treatment outfalls, the San Diego River, and the Los Angeles River. The study's authors, Slade and Cooper, emphasize the need for improved infrastructure, increased public awareness, and cross-border collaboration to address these issues effectively. They highlight that understanding the downstream effects of everyday products like sunscreen and tires is crucial for improving water and air quality.
While the focus of the sewage crisis has primarily been on water pollution, the study underscores that it is also an air pollution issue. The dynamic nature of coastal environments contributes to the aerosolization of pollutants, which can then be inhaled by residents. This has implications for public health, environmental policy, and international relations between the United States and Mexico. Cooper's work in this field influenced his subsequent role as a Science and Policy Technology Fellow with the California Council on Science and Technology, where he continues to address the political and policy challenges associated with the cross-border sewage crisis.
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Coastal pollution
San Diego's coastal communities face a significant threat to their air and water quality due to coastal pollution. The Tijuana River, flowing from Baja California into the United States, is the dominant source of this pollution. The river discharges millions of gallons of wastewater, sewage, industrial waste, and runoff into the Pacific Ocean daily. This has resulted in Southern San Diego beaches being closed for nearly three years due to high levels of bacterial pollution.
The impact of the Tijuana River's pollution extends beyond the water to the air as well. A study by the University of California, San Diego, revealed that pollutants in wastewater, such as illicit drugs, drug metabolites, and chemicals from tires and personal care products, can aerosolize and be inhaled by residents. The study found that exposure to these pollutants could lead to respiratory illness, insomnia, and headaches, with the potential for long-term health effects.
The issue of sewage pollution in the Tijuana River has persisted for over 50 years, and it is not the only source of wastewater pollution in Southern California. Other sources include wastewater treatment outfalls, the San Diego River, and the Los Angeles River. However, the dynamic nature of coastal environments means that the turbulence in rivers and streams can aerosolize wastewater, impacting the air quality for residents along the coast.
While the solutions to the sewage crisis are often seen as technical challenges, the more significant barriers are political and policy-related. To effectively address the problem, decision-makers need to be motivated to invest in better infrastructure and cross-border collaboration. Additionally, increasing public awareness about the downstream effects of everyday products, such as sunscreens and tires, can help improve the region's water and air quality.
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Carbon monoxide levels
Carbon monoxide (CO) is a colorless, odorless, and deadly gas that is harmful to humans and the environment. It is produced by the incomplete combustion of carbon-containing fuels, such as gasoline, natural gas, coal, wood, and propane. In San Diego, the current carbon monoxide level is well below the recommended limit, indicating that the air quality is satisfactory, and the risk to human health is minimal.
According to the World Health Organization (WHO), the recommended maximum carbon monoxide concentration in ambient air is 3500 ppb (parts per billion) over an average of eight hours. In San Diego, the current CO level is 134.2 ppb, which is significantly lower than the recommended guideline. This suggests that the air quality in terms of carbon monoxide pollution is generally good.
However, it is important to recognize that carbon monoxide levels can vary across different areas of San Diego. The city's topography, weather patterns, and local sources of emissions can influence the distribution of carbon monoxide. For instance, areas with heavy traffic, industrial activities, or residential heating systems may experience higher CO levels than others. Therefore, while the overall CO level in San Diego is currently low, there could be specific neighborhoods or regions that are more affected by this pollutant.
To maintain safe carbon monoxide levels and ensure public health, the San Diego County Air Pollution Control District (SDAPCD) implements regulations and initiatives. They monitor CO emissions from various sources, including vehicles, power plants, and residential buildings, and enforce standards to limit carbon monoxide releases into the atmosphere. Additionally, the SDAPCD promotes the use of cleaner energy sources, such as renewable energy and electric vehicles, to reduce the overall carbon monoxide emissions in the region.
In summary, while the current carbon monoxide levels in San Diego are well below the recommended limit, indicating satisfactory air quality, it is crucial to remain vigilant about potential sources of CO pollution. Continuous monitoring, effective regulations, and the transition to cleaner energy sources are essential to maintaining safe carbon monoxide levels and protecting the health and well-being of San Diego residents.
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Frequently asked questions
The Tijuana River is the biggest source of pollution in San Diego. The 120-mile river flows from Baja California into the United States and discharges millions of gallons of wastewater, sewage, industrial waste, and runoff into the Pacific Ocean every day.
The river's pollution has resulted in San Diego beach closures for nearly three years due to high levels of bacteria from wastewater runoff. The pollution has also led to respiratory illness, insomnia, and headaches among residents, with long-term exposure causing minor to moderate symptoms.
Researchers from the University of California, San Diego, are studying the impacts of the Tijuana River pollution and advocating for more research, better infrastructure, and cross-border collaboration to improve the region's water and air quality. The nonprofit environmental group American Rivers has also named the Tijuana River America's second most endangered river, bringing attention to the issue.
