Climate change and air pollution are closely linked. Some air pollutants are also greenhouse gases and contribute to climate change, such as ozone, for example. Climate change, for its part, will promote certain types of pollutants, such as more frequent conditions favorable to ozone formation, or increased concentrations of fine particulate matter associated with wildfires or Saharan dust storms. Finally, several policies aimed at reducing greenhouse gas emissions can improve air quality, and vice versa. It is very important to ensure the consistency of these policies and to work toward simultaneously reducing both pollutant emissions and greenhouse gas emissions.