John Graham-Cumming, Cloudflare: The core of London, where many people work, has seen a large drop and all the areas around including further out towns where people commute by train have seen rises. Other red spots are airports and large business parks with offices.

John Graham-Cumming, Cloudflare: New York's most striking change is the red at the tip of Manhattan where Wall Street can be found.

John Graham-Cumming, Cloudflare: In the Bay Area you see San Francisco red because many people live on the peninsula and work in the city. You also see large drops in Sunnyvale and San Jose where large employers have sent people home.

John Graham-Cumming, Cloudflare: In Washington State you see the effect of large employers like Microsoft sending their staff home.