Filed Wednesday by Communities for a Better Environment, it claims city planners wrongly designated the Neptune Society crematorium a general manufacturing facility that could be approved without a public hearing.
Residents say they are worried the crematorium will add to pollution that already exists because of a nearby freeway and airport.
Neptune Society spokesman Mike Miller tells the San Francisco Chronicle ( http://bit.ly/Jaq7Qx) he hasn't seen the suit so he wouldn't comment.
The city approved a crematorium in 2012 after air quality management district said there wouldn't be enough pollution to put the community at risk.
Information from: San Francisco Chronicle, http://www.sfgate.com