Surface ozone pollution, commonly known as ground-level ozone, occurs when pollutants from vehicle exhaust, industrial facilities and other sources react with sunlight and heat. This results in the formation of ozone, which can be harmful to human health and the environment. There are several synonyms for surface ozone pollution including smog, tropospheric ozone, low-level ozone, and ambient ozone. These terms refer to the same phenomenon of ozone pollution at ground level, which can cause respiratory problems, aggravate asthma and other lung conditions, and damage crops and vegetation. Prevention of surface ozone pollution requires reducing emissions from sources such as vehicles and industrial facilities, as well as implementing effective air quality management policies.