 Ozone is a harmful air pollutant that can damage both human health and vegetation. It is primarily caused by the reaction between nitrogen oxide and volatile organic compounds, which are reduced during the summer months due to stricter environmental policies. However, this does not mean that ozone levels are lower in other seasons, in fact, they remain high throughout the year. This is because of the presence of unidentified radicals that produce ozone at a faster rate than the natural degradation process. These radicals must be identified and controlled in order to reduce ozone levels in all seasons. This article was authored by Wang Hongli, Lu Yanhui, Chen Shiuwei, and others.