Waller R E, Commins B T, Lawther P J
Br J Ind Med. 1993 Aug;50(8):128-38.
Measurements of the concentrations of smoke, lead, and five polycyclic hydrocarbons in the air have been made in the City of London in the middle of a busy street and at two control sites. Samples were taken only throughout the daytime hours on weekdays to enable us to assess the maximum contribution made by traffic to the pollution in the street. The results showed that during these periods the air in the middle of the street contained three times as much smoke, four times as much lead, and 1.7 times as much 3:4-benzpyrene as were present in the general atmosphere as the City of London as estimated from samples taken at the control sites. One of these sites was chosen because it was only 150 feet away from the street; analyses yielded no evidence that the traffic contributed to the pollution sampled there. Sulphur dioxide concentrations were determined in the early part of the study and the results showed that traffic appeared to add little to the background level. The concentrations of lead found were below those held to be safe by many authorities. Carbon monoxide concentrations, reported in greater detail elsewhere, sometimes reached the accepted industrial maximum allowable concentration of 100 p.p.m.
在伦敦市一条繁忙街道的中央以及两个对照点对空气中烟雾、铅和五种多环烃的浓度进行了测量。仅在工作日的白天时段采集样本，以便我们评估交通对街道污染的最大贡献。结果表明，在这些时间段内，街道中央空气中的烟雾含量是对照点采集的样本所估计的伦敦市总体大气中烟雾含量的三倍，铅含量是四倍，3:4-苯并芘含量是1.7倍。其中一个对照点之所以被选中，是因为它距离街道仅150英尺；分析结果没有证据表明交通对在那里采集的污染样本有贡献。在研究初期测定了二氧化硫浓度，结果表明交通似乎对背景水平贡献不大。所测得的铅浓度低于许多权威机构认为安全的水平。一氧化碳浓度在其他地方有更详细的报道，有时会达到公认的工业最大允许浓度100 ppm。
