Google's Street View cars track air pollution and other news

BBC Click's Lara Lewington looks at some of the best of the week's technology news stories including:

  • Apple announces a voice-activated speaker powered by Siri, its virtual assistant

  • Video-recording sunglasses from the company behind Snapchat go on sale in the UK

  • Google's Street View cars produce an air pollution map

See more at Click's website and @BBCClick.