For companies and brands, this means optimising press sites for mobile, or else missing out on customers who are using smartphones and tablets.
The update to Google’s algorithms aims to ensure that "users will find it easier to get relevant, high quality search results that are optimised for their devices".
Matt Thomson, managing director of comms agency TheNewsMarket, said: "Too many brands are missing out due to journalists getting turned off by press sites that frankly don’t work on mobiles. A quick check on Google’s test site (google.com/webmasters/tools/mobile-friendly) will tell you if you need to take action."
TheNewsMarket has seen mobile traffic to its YourNewsMarket platform, which uses responsive web design for mobile optimisation, shoot up to 41 per cent in Q1 2015 from 26 per cent in Q1 2014.