Every big and small city has a great problem of utilization of tires. Year by year the number of cars increases and the number of worn-out tires increases correspondingly. Common city dumps don’t take worn-out tires for utilization; parking lots are already overfilled with them, so these waste products are knocked down to roadsides, plantings and ravines, etc. According to the study conducted by American and Swedish experts the tires are a very dangerous part of the car as the dust, which arises in the result of rubber amortization, can cause very serious illnesses.

For example, in Sweden alone over 10 000 tons of the rubber dust is discharged in the atmosphere each year. And in Los Angeles about 5 tons of it is discharged in the atmosphere every year, though Los Angeles is considered to be environmentally friendly city. And globally, the number of these harmful emissions is more than 1 million tons. According to the most optimistic calculations, every day a citizen of Sweden inhales about 6 gr. of rubber dust, and an average American inhales approximately 13 gr. of it.
And, for example, in Russia this figure can reach up to 20 gr. for each person per day according to preliminary estimates of experts.
Dumped or buried tires decompose for more than 100 years in natural conditions. And even if the rubber is not used it yet discharges a certain amount of harmful chemical substances. Altogether rubber includes about 15 harmful compounds of polyaromatic hydrocarbons and a lot of harmful carcinogens. Also, rubber contains 4 of 12 kinds of N-nitrosamines. All the substances mentioned above are included in the list of dangerous toxins, which was made by the International Organization for Research on Cancer and the Environmental Protection Agency USA.

According to the estimates of the experts in this field the rubber dust contains far more carcinogens than the exhaust gasses from automobile engines, which have previously been considered as the main source of pollution.
When tires contact with rainfall and ground water, there occurs the removal of a number of toxic organic compounds such as: -1-(3- methylphenyl) ethanol, azulene, benzothiazole, 2-methylbenzothiazole, N-(2,2-dimethylproyl)-N-methylbenzamin, butylated hydroxytoluene, diethylphthalate (has distinctive cumulative features), 2-(methyl)- benzothiazole, diphenylamine (the 3rd level of danger), dibutilphthalate, phenanthrene. Also the other groups of organic substances cannot be excluded, as different plasticizers, etc. are used in different countries for the tires production. Non-toxic organic substances can be seen among them very seldom. Rubber is a high-molecular substance, and is related to thermosetting polymers, which, unlike thermoplastic polymers can not be processed at high temperatures, which creates very serious problems with the recycling of rubber waste.
On the other hand, tires and plastics are valuable raw materials for processing by the low-temperature pyrolysis method, in the result of which liquid hydrocarbons (synthetic oil), carbon residue (technical carbon), steel and combustible gases are obtained. Also by burning 1 ton of tires, 270 kg. of soot and 450 kg. of toxic gases will be discharged in the atmosphere. Only no more than 20% of the total mass of worn-out tires is processed throughout the world. As the result there will be the continuous accumulation of the excess weight, which is a very serious environmental and economic problem.