Join Californians for clear air and take the Clean Air Pledge! When it comes to air pollution, we can all do our part. Whether you're an individual, business, government agency or nonprofit organization, there are things we all can do to improve air quality and protect public health. In a state with some of the worst air pollution in the United States, it is imperative that we do. California Clean Air Day is built on the idea that shared experiences unite people to action to improve our community health. By joining together for a unified day of action we can create new habits to clear the air for all members of California's diverse communities. The Clean Air Pledge allows individuals and organizations to commit to do our part to clear the air, through actions big and small. When you take the Clean Air Day Pledge, you will see two options: to register as an individual and/or household or to register on behalf of an organization. California Clean Air Day is a project of the Coalition for Clean Air.