1) Section 268 of the Indian Penal Code, defines public nuisance as “an act or illegal omission which causes any common injury, danger or annoyance, to the people in general who dwell, or occupy property, in the vicinity, or which must necessarily cause injury, obstruction, danger or annoyance to persons who may have occasion to use any public right.”Simply speaking, public nuisance is an act affecting the public at large, or some considerable portion of it; and it must interfere with rights which members of the community might otherwise enjoy
2) you can file complaint with magistrate under section 133 cr pc for removal of public nuisance
3)
Whenever a District Magistrate or a sub-divisional Magistrate or any other Executive Magistrate specially empowered in this behalf by the State Government, on receiving the report of a police officer or other information and on taking such evidence (if any) as he thinks fit, considers—
(a) That any unlawful obstruction or nuisance should be removed from any public place or from any way, river or channel which is or may be lawfully used by the public; may pass orders
To remove such obstruction or nuisance; or