Warning Description: Special Weather Statement Warning Date: 1:48 PM CDT on July 30, 2010 WarningSum:...Ozone Watch Issued On Saturday... Warning Message:The Texas commission on environmental quality...has issued an ozone watch for the Houston...Galveston...and Brazoria areas for Saturday...July 31. Atmospheric conditions are expected to be favorable for producing high levels of ozone pollution in the Houston...Galveston...and Brazoria areas. Elevated concentrations of ozone can act as a lung irritant. Individuals with chronic lung disease...such as asthma and emphysema...and the elderly and small children...are particularly sensitive to ozone and should attempt to avoid exposure. To avoid exposure...minimize exertion outdoors during the mid-day to early evening hours or stay indoors in an air conditioned area during this time. Ozone reaching excessive levels at any site in the area may move to or from other sites within the area...depending on wind direction and other factors. Excessive levels may linger until sunset. Ozone warnings will be issued if air pollution levels are detected at unhealthy levels.