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 help explain extremely poor air quality in the nation’s largest underground transit system and have particular implications for stations close to rivers in general.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 help explain extremely poor air quality in the nation’s largest underground transit system and have particular implications for stations close to rivers in general.

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