An outbreak of wildfires in California last year worsened smog pollution in rural areas and caused levels to spike above federal air quality standards. California witnessed an intense wildfire season in 2007 with drought conditions and unusually powerful Santa Ana winds fanning flames. Over one million acres were blackened by the numerous wildfires. The Environmental Protection Agency sets a standard that air quality if poor if the amount of ozone is greater than 75 parts per billion. Ozone, which needs sunlight to form, is a yellow haze of pollutants that hangs in the air. Ozone exposure can raise the risk of respiratory illnesses, especially among the elderly and children.