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According to Japan %26quot; news of daily newspaper industry %26quot; report, the Chai Tiankang of institute of the Neitianchangnan's researcher that ocean of the assistant of ursine Tian Yingfeng of university of Tokyo drug family, Japan studies to develop research center of observation of orgnaization world environment and Japanese national environment, be opposite jointly the pollutant much annulus in Tokyo suburb air hydrocarbon of scent a group of things with common features (PAH) undertook investigating. The result confirms, in atmosphere, about 20%% comes the material of the sex that cause cancer of 40%% , it is to come from the biology carbon that produces at the plant burns.

　 In the test that in Tokyo suburb upland area has, researcher is draw-out about 60 thousand stere arrives the air of 150 thousand stere. In draw-out air, they collected a diameter to be mixed below for 10 micron diameter the little grain material under 1 micron, the carbolic plain part that contains to PAH undertook an analysis. Carbolic analysis is with be being decreased partly period for the carbon of body of radioactivity carbon parity 5730 14 those who be index, carbon is not contained in general fossil fuel 14, but contain carbon however in plant carbon element 14 composition. Researcher discovers after classics analysis, in the diameter the grain under 10 micron and extremely easy by the diameter with inspiratory human body in the grain content under 1 micron, have 21%% the carbolic composition to 46%% is to come from modern plant. Before this, the mankind still cannot distinguish the carbon in the carcinogen PAH in atmosphere is to come from the fossil fuel such as oil to still come from modern plant after all.

Researcher thinks, the carbon in atmosphere basically should come from rubbish and enter the water of mud burn, still include a farmer to burn the fireweed in cropland. Use this kind of new analysis method, the scientist can is opposite the circumstance of atmospheric of biology fuel pollution of step up does labor in the future, also can master the influence of large-scale forest conflagration to atmosphere environment from this. (Chen Chao)