RIVERSIDE (CNS) - The South Coast Air Quality Management District has extended a mandatory prohibition on indoor and outdoor wood burning in much of the Southland through tonight due to a forecast of high air pollution in the area.The residential wood-burning ban now extends through 11:59 p.m. Saturday for all those in the South Coast Air Basin, including Orange County and non-desert portions of Los Angeles, Riverside and San Bernardino counties.It was the second straight day the ban was extended. The original ban had been in effect through 11:59 p.m. Thursday. The order does not apply to mountain communities above 3,000 feet, the Coachella Valley or the high desert. Homes that rely on wood as a sole source of heat, low-income households and those without natural gas service also a