It can permanently damage our hearts and lungs.
Air pollution comes from our cars, factories and consumer products.
We've cut smog by two-thirds since 1955 by cleaning up pollution sources, but there's more work ahead. Our air remains the dirtiest in the nation. South Coast Air Quality Management District monitors smog and, with public support, takes action to make our air safe to breathe. Fifty years of fighting smog has helped. With a little more work, they'll soon be eliminated.