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Underground Air - Associated With - DNA Damages

According to a new doctoral thesis from Karolinska Institutet, our everyday environments are full of airborne// particles that are harmful to varying degrees when inhaled. Particularly damaging to our cellular DNA are the particles from the underground system in Stockholm, Sweden.

"Luckily, most of them do not remain in the underground for any length of time," says scientist Hanna Karlsson. "However, particle levels are often very high. My results show that there is every reason to speed up the work being done to clean the air in the underground."

Every year, some 5,300 Swedes die premature deaths from inhaling the microscopic particles of coal, asphalt, iron and other materials that pollute the city’s air. These particles, which are the result of incomplete combustion, road surface attrition, etc. could be reduced if the right steps were taken; the problem is that it is not known which particle sources pose the greatest threat to human health.

To build up a picture of which particles are the most harmful, Dr Karlsson has compared how particles from a variety of sources affect cultured lung cells. The results, which are presented in her thesis Particularly harmful particles show that particles from the Stockholm underground are much more damaging to cellular DNA than the other sources tested (e.g. wood smoke and cars).

The airborne particles in the underground system largely comprise iron, and are formed by the abrasion of the train wheels against the rails. The damage is caused when these particles enter the body and form free radicals in the body’s cells. Free radicals are highly reactive molecules that can prove harmful to the cell’s DNA; although such damage can often be repaired by the cell, it can sometime remains untreated, and this increases the risk of cancer.

Another type of particle that stood out in the studies was that caused by the friction between car tyres and the road surface. The report shows tha
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