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"Medical experts say overuse of antibiotics in Europe, the United States and other wealthy regions is building widespread resistance in and threatening vital medical treatments from hip replacements and cancer therapies, to intensive care."Sources:


Because they are exerting themselves, cyclists breathe harder and faster than other road users. The study found that they suck in about 1,000 cubic cm with each breath, meaning they may inhale tens of millions of the particles each time they fill their lungs, and billions during a whole journey.
"This is the first time anyone has counted the particles while also measuring people's breathing during city commuting. It showed that cyclists can inhale an astonishing number of pollutant particles in one journey," said Luc Int Panis of the transport research institute at Hasselt University in Belgium, who led the study.