Do you know the meaning of -until now_? It clearly says

From May, the emergency vehicles will charge a fixed rate of 50 yuan ($8; £5) for patients being transported up to 3km (1.9 miles), and then seven yuan for each kilometre travelled after that, the Beijing Morning Post reports. If an ambulance is called but then not needed, a 50-yuan charge will still apply, the paper notes.

It means from 2016 they'll charging in this method that costs a lot less