Can I sue my landlord for negligence?

There has been a gas smell for two years, we've told the super and manager and nothing was done about it. We couldn't take it anymore so we called Conedison. Conedison came and said all the pipes need to be renewed. Manager failed to renew the pipes. I had constant headaches and dizzyness because of the gas. They fail to do any repairs. The ceiling is leaking for over a year, and they don't do anything about it either.