Time: 2024-07-05
California 's efforts to reduce vehicle emissions have shown progress , but new research suggests that urban trees may be contributing to persistent Air pollution issues . Despite declining emissions from vehicles , microscopic particles and ground - level ozone levels remain high due to secondary sources like trees and shrubs in cities like Los Angeles . A recent study conducted by US researchers involved direct measurements of volatile organic compounds ( VOCs ) over Los Angeles , revealing that botanical sources of VOCs contribute significantly to the formation of secondary organic aerosols in the city.
The researchers used an airborne approach to measure VOCs multiple times a second , providing detailed information on over 400 types of emissions . The study found that compounds like isoprene , monoterpenes , and sesquiterpenes from botanical sources accounted for around 60 % of secondary organic aerosol formation in Los Angeles . As temperatures rise , botanical emissions increase , posing a potential risk for worsening air quality in the summer months . The findings highlight the need to monitor and address sources of VOCs to mitigate air pollution in urban areas.
Ambient air pollution remains a significant health concern globally , with fine particles and ozone posing risks to respiratory health and overall well - being . VOCs play a key role in the formation of these harmful substances , emphasizing the importance of identifying and reducing sources of these compounds in major cities . With an estimated 4.2 million premature deaths attributed to airborne pollution each year , health authorities are striving to improve air quality and protect public health.
Urban trees and plants release biogenic volatile organic compounds ( BVOCs ) , contributing to pollution levels in cities like Los Angeles . While efforts to increase urban greenery aim to address climate change and improve air quality , the study suggests that trees and shrubs may inadvertently worsen pollution levels . Understanding the emissions from botanical sources is crucial for developing strategies to minimize their impact on air quality.
The debate over biogenic versus industrial sources of air pollution continues , particularly as temperatures rise . Researchers note that different compounds react differently to temperature changes , highlighting the complexity of addressing air pollution issues . Despite the challenges , maintaining green spaces in cities is essential for mitigating the urban heat effect and promoting overall health and well - being.
In conclusion , the findings underscore the need for comprehensive strategies to address air pollution from various sources , including urban trees and plants . By understanding the contributions of different compounds to air quality , policymakers can work towards reducing pollution levels and safeguarding public health . As climate change continues to pose challenges , proactive measures are essential to protect the natural environment and ensure clean air for all.
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