Volunteers around the world have been testing a pollution backpack, gathering data that experts say suggests air-quality levels may be rising again


Subscribe: http://smarturl.it/reuterssubscribe

Reuters brings you the latest business, finance and breaking news video from around the globe. Our reputation for accuracy and impartiality is unparalleled.

Get the latest news on: http://reuters.com/
Follow Reuters on Facebook: https://www.facebook.com/Reuters
Follow Reuters on Twitter: https://twitter.com/Reuters
Follow Reuters on Instagram: https://www.instagram.com/reuters/?hl=en