KEY POINTS

A new online ad format is proving less annoying to people, and it's one that allows advertisers to reach a more relevant audience: digital audio.

Online advertising is currently under much scrutiny, with around 30 percent of Americans set to use ad blockers on their smartphones and other devices this year, up from 27.5 percent in 2017. The industry has responded by tackling poor online advertising with new Better Ad Standards guidelines, with Google starting to block "bad" ads in its Chrome browser from February.