In the world's major cities, the subway because of its convenient punctuality to become the first choice for people travel.However, a recent study by the University of Southern California found that the carcinogen toxin in the subway car is more than 10 times the car, greatly exceeded the safety standards.Expert reminds, To avoid inhalation of carcinogenic toxins, wear a mask when riding the subway.
The researchers found that the railroad track contains a metal called chromium, which generates hexavalent chromium when the train rubs with the track, a hexavalent compound that can cause cancer. In addition, the train and the rail also produce a pair of friction Due to poor ventilation, these dust will remain in underground tunnels and subway cars, and the dirty air inside the car contains a carcinogen called PAH that can enter the lungs of people and Other organs, causing nasal cancer and sinus cancer caused by factors that cause irritation to the human skin and eyes.The team's test results show that the Los Angeles, the busiest several subway lines in the compartment, the toxic substances in the United States government and the world health Organized by 10 times the content of toxic substances in. Los Angeles's subway is not the world's busiest, New York, London and other cities subway frequency more frequent passengers more carcinogenic toxins levels may be higher.
The researchers said the new study shows that taking the subway may pose a threat to the health of commuters who suggest that the metro system, especially the subway car, should be ventilated to prevent the accumulation of toxins and, for the majority of commuter commuters, It is best to wear a mask when taking the subway
