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The biological effects of indoor sunlight in dwelling houses was studied in the southern part of Anhui Province, China. It was revealed that : (1 ) The indoor UV intensity correlated positively to the outdoorUV with a regression coefficient of 2. 51 μW/cm2 ; (2) For a south - facing house with three hour exposureper day to sunlight around the winter solstice , the deactivation rate of indcor sunlight for Staphylococcus albus , Streptococcus viridans and Streptococcus heinolyticus was 95. 9 % , 80. 0% and 51. 9 % , respectively.The rate was twice as high as that for a north - facing house : (3) Among all the mice infected by Sahnonellatyphimurium , 70% of those receiving 3h exposure keep alive for seven days after infection, while the mice inthe control group (without exposure) all died; (4 ) In dogs receiving 3h exposure, rachitic signs occurredmuch later and without deformity of limbs , the epiphyseal cartilage's tongue was shorter and its length wasnegatively correlated with sunlight intensity (for ulna r= -0. 63 , for tibia r= 0. 71 ). It is suggested thatdaily exposure to sunlight at noon around the winter solstice should be longer than three hours and this mustbe considered when new houses are designed.
