Chinese scientists discover that trees are producing ozone smog in Beijing

New research from Chinese scientists suggests that Beijing's extensive urban trees, particularly weeping willows and poplars, may be contributing to the city's air pollution. These trees, which have provided shade for over forty years, could be increasing ozone levels in the air. Scientists have warned that this urban greenery might be exacerbating the problem for Beijing's 20 million residents. While ozone smog from car exhaust has long been a recognized public health issue, this research highlights a potential natural contributor to the problem within the city itself.