Subway stations near river tunnels have worst air quality

Subway riders waiting in stations near tunnels that run below the city's rivers are exposed to higher levels of hazardous pollutants than are found in other stations. The "river-tunnel effect," as researchers call it, may ...

Elon Musk presents underground LA tunnel project

Entrepreneur Elon Musk has given updated details of a project to build high-speed transport tunnels underneath Los Angeles in a bid to combat traffic and said he wanted to work with the city's subway operator.

Commuting by subway? What you need to know about air quality

,Four more major Indian cities will soon have their own metro lines, the country's government has announced. On the other side of the Himalayas, Shanghai is building its 14th subway line, set to open in 2020, adding 38.5 ...

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