The study, published in the journal Environmental Health, looked at the impact of trees on air quality in London over a 12-month period. The researchers used a combination of field measurements, computer modelling, and satellite data to assess the amount of air pollution removed by trees.
The findings showed that trees in London remove a significant amount of air pollution, including particulate matter (PM), nitrogen dioxide (NO2), and ozone (O3). PM is a major component of air pollution and is linked to a range of health problems, including respiratory and cardiovascular diseases. NO2 is a gas that can cause inflammation of the airways and can contribute to asthma. O3 is a gas that can damage the lungs and is associated with an increased risk of respiratory problems.
The researchers found that trees in London remove approximately 14 tonnes of PM, 159 tonnes of NO2, and 21 tonnes of O3 per year. These figures represent a significant contribution to air quality in the city.
The study also found that the benefits of trees are not evenly distributed across London. Trees in central London remove more air pollution than trees in outer London, due to the higher levels of air pollution in central London.
The researchers concluded that trees are a valuable asset to London and that their role in improving air quality should be recognised. They recommended that more trees should be planted in London, particularly in areas with high levels of air pollution.
The study's findings are in line with previous research on the impact of trees on air quality. A number of studies have shown that trees can remove significant amounts of air pollution, including PM, NO2, and O3.
The benefits of trees go beyond air quality improvements. Trees can also provide shade and shelter, reduce noise pollution, and improve mental health. They are an essential part of any urban environment and should be valued and protected.
