Greater San Diego has the sixth worst ozone pollution in the country for the fifth year in a row, a report released Wednesday by the American Lung Association says. Local officials said it’s time to take action and protect the communities most affected.San Diego County Supervisor Nathan Fletcher and officials from the American Lung Association and local environmental groups held a press conference at Cesar Chavez Park in Barrio Logan to discuss the annual air quality report, which estimates more than 40 percent of Americans live with unhealthy air quality.