ABSTRACT
When earlier work mainly dealt with the treatment of waste water, PCO recently has received considerable attention regarding the removal of pollutants in air. Since about 10 years efforts are made, first in Japan, in a large scale application of this photocatalytic reaction for air-purifying purposes. For the degradation of exhaust gases originated from traffic a sheet-like application close to the source would be desirable. Large illuminated surfaces in the road environment are for example road noise barriers and the road or sidewalk surfaces itself. Therefore noise barrier elements and paving stones are interesting substrates to study.
