Despite the growing trend in people "going green," sixty percent of Americans live in areas with unhealthy air pollution levels. The American Lung Association says this information is based on pollution levels in U.S. cities and counties between 2005 and 2007. They found that air pollution at times reaches unhealthy levels in almost every major city and that over 186 million people live in those areas. That number is much higher than last year's figure of about 125 million people because of recent changes to the federal ozone standard. This change shows that more counties recognize unhealthy levels of pollution. However, cities such as Los Angeles, New York, Atlanta, Charlotte, Philadelphia, Washington D.C. and Baltimore have seen improvements in air quality over the last decade. Health effects from air pollution include changes in lung function, coughing, heart attacks, lung cancer and premature death.