Salton Sea Dust Impairs Lung Development in Imperial Valley Children, Study Finds
New research indicates that dust originating from the shrinking Salton Sea is hindering the lung development of children in Southern California's Imperial Valley, particularly those residing closer to the lake. The study's findings suggest these effects on lung function are more pronounced than impacts observed in urban California communities located near heavily trafficked roadways.
Key Research Findings
Epidemiologists from the University of Southern California and the University of California, Irvine, conducted a study that assessed respiratory health among elementary school-aged children. The research found a correlation between exposure to Salton Sea dust and impaired lung growth in these children. Reduced lung function in early life increases the risk for chronic respiratory diseases and more frequent respiratory infections in adulthood.
Children are considered more vulnerable to the adverse effects of air pollution due to their developing lungs, higher respiratory rates, a larger lung surface area relative to body size, and increased time spent outdoors engaged in physical activity. Lung function continues to mature throughout adolescence.
The Diminishing Salton Sea: An Environmental Overview
The Salton Sea, California's largest inland lake, has been diminishing for decades. Formed by a canal breach from the Colorado River in the early 1900s, its water levels were historically maintained by agricultural irrigation runoff. Factors contributing to its shrinkage include drought, agricultural water diversion, and climate change. The lake is situated 235 feet below sea level in a hot, arid region of California, approximately 150 miles southeast of Los Angeles, bordering the Imperial Valley agricultural region.
The reduction in water levels has exposed an estimated 36,000 acres of dry lake bed. Historically, agricultural runoff carried fertilizers, pesticides, salt, and toxic metals into the lake. These substances have concentrated in the lake bed sediments and become airborne when wind passes through.
Water Policy's Impact on Dust Emissions
In 2003, the Imperial County's irrigation district, which is the largest consumer of Colorado River water, agreed to reduce its water usage to support urban areas. This plan, fully implemented in 2018, resulted in less runoff entering the Salton Sea. This change was projected to increase windblown dust by 40 to 80 tons daily. Satellite imagery confirms a rapid expansion of the exposed lake bed as water recedes.
The AIRE Study: Documenting Child Respiratory Health
In 2017, the Assessing Imperial Valley Respiratory Health and the Environment (AIRE) cohort study was initiated. This study involved over 700 elementary school-aged children across five northern Imperial Valley cities and was conducted in partnership with Comité Cívico del Valle, a local nonprofit. Researchers documented respiratory health symptoms and lung function measurements over several years, alongside household, lifestyle, and behavioral factors. The children who participated in the AIRE study are now in high school.
Key findings from the AIRE study include:
- Approximately 1 in 5 children in the northern Imperial Valley were reported to have asthma, a rate higher than the national average.
- Elevated rates of air pollution were associated with poorer reported respiratory health, such as wheezing and coughing, across all children studied, affecting both asthmatic and non-asthmatic participants.
- Higher dust exposure, especially among children living closer to the Salton Sea, correlated with poorer lung function and reduced lung growth over time.
Community Concerns and Future Implications
Predominantly low-income Latino communities located south of the Salton Sea have expressed concerns about environmental justice, reporting they have been overlooked in discussions regarding the lake's future. These communities cite direct health consequences tied to regional water policy decisions and perceived insufficient action to manage the environmental situation. Community members have consistently voiced concerns about high rates of asthma and respiratory issues among residents.
The AIRE study provides scientific evidence supporting these community observations and concerns. This data is considered relevant for informing future planning regarding water changes, proposed lithium extraction projects, and other development near the Salton Sea.
The study emphasizes that protecting local air quality is crucial for the health of Imperial Valley children and suggests their health considerations should be a primary factor in future planning. This evidence also supports advocacy efforts by communities and organizations such as Comité Cívico del Valle for projects aimed at reducing airborne dust from the Salton Sea, expanding asthma management education, and improving access to healthcare services. Further increases in air pollution are anticipated due to continued reduction of the lake's water sources and planned industrial activities in the region.