Each subway line seemed to have its own specific microbiome signature during the morning hours, as people left home for work. For example, the MOS line, which runs along Shing Mun channel, was full of aquatic bacteria – an abundance that wasn’t found in the more inland routes. The WR line, which passes through a mountainous region in the New Territories, had a relatively high abundance of those species that prefer to live around 1,000 meters (about 3,280 feet) in altitude.

Source: Los Angeles Times August 01, 2018 20:03 UTC