Six very large coal-fired power plant complexes operate within 30 miles of Evansville: Indiana-Michigan Power's Rockport Generating Station, near Rockport, Indiana, AES Indiana's Petersburg Generating Station near Petersburg, and Duke Energy's Gibson Generating Station near Mount Carmel. Evansville-Based Vectren operates the other two; the A. B. Brown Generating Station, located just west of Evansville, and Warrick County Generating Station/F. B. Culley Generating Station complex, east of Newburgh, largely owned by Alcoa. In addition, another coal fired power plant complex, The R.D. Green Station, operated by Touchstone Energy's Big Rivers Electric, exists 20 miles south of Evansville, near Sebree, Kentucky. The levels of fine particles in the air in Vanderburgh County were almost as high as in Manhattan, New York City.