Long-term variability of air pollution with black carbon in the region of Beijing in autumn periods

Results of measurements of the black carbon and fine aerosol content in Beijing and in a background region 150 km to the northeast of the capital of China are analyzed. The measurements have been carried out for many years, mainly in autumn periods. A regional decrease in the black carbon concentration has been found. The conclusion made in earlier works about the decrease in the relative contribution of soot aerosol, on average, with an increase in air turbidity has been corroborated.