On her first day in post, Meri Huws says her role is about protecting the rights of Welsh speakers.
She says she will use her enforcement powers if necessary, but says her target won't be small businesses in predominantly English-speaking areas, the proverbial 'Chepstow chip shops.'
More top news
The Welsh Assembly election is less than a week away and the treatment and care of cancer is one of the more contested issues.
Tributes have been paid to an ambulance driver killed in a crash with another ambulance in North Wales.
Tonight is expected to be clear and dry - though some parts of Wales will experience frost.