From San Francisco’s Lombard Street and the Hollywood Sign to glistening miles of beaches and mighty redwood forests — many world-famous landmarks are located in California, memorialized through countless photographs. What isn’t captured in these famous photos of California landmarks? Air.

While California is home to these beautiful and iconic landscapes, eight of the most polluted cities in the United States also call California home. No part of California is immune: last year, California had some of the worst air quality in the world.

California Clean Air Day allows you to do something about it. This unified day of action serves as a reminder that all Californians can do something to make our air cleaner. By focusing community, media, and individual attention around the single day, one would be hard-pressed not to be engaged on clean air on Clean Air Day. Social science research shows that people take action when they see others around them — people they look up to as well as their peers — doing the same thing. This will be a whole community approach modeled after efforts like Earth Day that allows for everyone to participate, and produces an impact greater than the sum of the individual actions.

California Clean Air Day has a ambitious and attainable goal of producing at least 1 million clean air actions in support of this statewide day of action on October 3, 2018. These actions can be taken by individuals, companies, government entities, and even communities. This day will be the starting point for shifting the actions taken by all California to clean the air and protect our health and wellbeing in the years to come.