This data contains figures for the amount of waste entering city disposal facilities.

This is listed as "Special waste" in the dataset, which is labelled as "Special waste: Hazardous waste requiring a permit for disposal purposes."

This dataset combines two files: the Jan 2011-April 2015 waste disposal dataset, and the Jan 2015-Jan 2018 dataset. The former dataset is more detailed (waste is broken down into more categories), so for the overlapping period (Jan-Apr 2015) data from the first dataset was used. The figures were similar but for some months these numbers were not exactly the same.