As a result, scientists and medical experts now agree that air quality can be a year-round problem. It is also believed that there is no safe level of exposure to smog. These particles give smog its colour. These particles are generated as wind-blown dust from roads, construction sites and agricultural areas, as ash from forest fires, and as emissions from vehicles and industry. Near the ground, ozone is a serious pollutant.
Smog is by no means the only air pollution issue.
Atmospheric environmental issues that are related to clean air also include climate change and ozone layer depletion. Many of the actions we take for cleaner air also have a benefit in addressing climate change, particularly those with transportation and energy production.