(CNN) Rough day at work? Step outside and take a deep breath -- err, maybe not, depending on what city you're in. If you're in Los Angeles, you'll probably want to step back inside the office. The sprawling California city is among the worst air pollution offenders in the United States, according to the American Lung Association. Just before Earth Day, the association released its 2016 State of Air report. The findings reveal more than 50% of Americans live in areas with unhealthy levels of particle pollution, tiny solid and liquid particles floating around the air we breath, or ozone pollution, harmful gases that react to sunlight.California cities were some of the worse air pollution offendersCities in Vermont, Hawaii and New York had some of the cleanest airApril 22 is Earth Day
Heavy road traffic and a busy trade port are major contributors to _' poor air pollution.