Translation:Where is the bus?
Depends upon where you're at. 公共汽车 is formal, standard, written Chinese that I learnt from both a teacher from 上海 and 北京. The address below is to Wiktionary and includes a chart of plenty of synonyms for bus in Mandarin dialects (as well as others). Hope this clears up confusion. https://en.m.wiktionary.org/wiki/%E5%85%AC%E4%BA%A4%E8%BB%8A