Abstract. The most important sources of heavy metal contamination in their order of significance are air pollution, river sediments, sewage sludges, town waste composts, agricultural chemicals, and industrial waste.Lead accumulation in plants near highways and roads has decreased considerably since the law controlling the lead content of petrol came into force. Hazardous amounts of lead, however, are still concentrated 10-20 m along the sides of highways and roads, and in the strip of up to 5 m there are also higher concentrations of cadmium.

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