Wood-Crete Acid Rain and Ozone Bnd Houses Are Taking A Toll Information Supplied By Gerard D. Hertel, National Program Manager, Forest Response ... Scientific information was needed to support decision making regarding acidic deposition and ozone control and abatement measures. ... In winter this box in Pennsylvania is home to over 20 bluebird: which roost together for warmth. ... Annual cleaning eliminates parasites, encourages new nests Tizfted Tilmouse in in Spring.