The World Health Organization’s International Agency for Research on Cancer has unanimously agreed that diesel exhaust is a Group 1 human carcinogen. The evidence available today indicates that diesel exhaust is a cause of lung cancer, with more limited evidence that it may cause bladder cancer. It is less clear what level of exposure is needed to increase the risk of disease. This WHO noted that, like most carcinogens, when there is high exposure, risk is higher, and when exposure is low, risk is low.
PositiveTip: Avoid breathing diesel exhaust as much as possible.