Jq. Wang et al., STUDY ON MASS CONCENTRATION OF AIRBORNE PARTICULATE CAUSED BY TRAFFICIN BEIJING, Pure and applied chemistry, 67(8-9), 1995, pp. 1472-1474
The use of coal as fuel was, until recently, by far the most important
source of particulate matter in Beijing. Increased intensity of traff
ic contributes to the emission of especially smaller particles at an i
ncreasing rate. The fraction of inhalable and respirable particulate m
atter in the total amount of suspended particulate matter has increase
d snbstantially.