Abstract: By using URG Model 2000-01J and Aethalometer, the atmospheric black carbon concentration in Guiyang City was continuously detected from September to November, 2008. The 24 h atmospheric black carbon concentration during the detection period was 1.6-12 μg·m^-3, with a mean value of 4.1 μg·m^-3. The 12 h atmospheric black carbon concentration was mainly in the range of 2-5 μg·m^-3, its daytime variation range was 1.9-9.2 μg·m^-3, with a mean value of 3.9 μg·m^-3, and its nighttime variation range was 0.48-15 μg·m^-3, with a mean value of 4.3 μg·m^-3. The atmospheric black carbon concentration had the same variation trend as atmospheric PM_2.5 concentration, and there existed a positive correlation (r=0.84, P<0.0001, n=178) between them. The variation trend of the atmospheric black carbon concentration was also affected by the relative humidity, temperature, and wind speed.

Key words: Genetically engineered microorganism (GEM), Ecology, Molecular biology