Older landfills may, however, be of greater concern. Whilst post-Landfill Directive changes and the consequences for HHW have yet to be examined, it would appear that the requirements made will not provide any further mitigation of risks than currently offered through engineered landfills and leachate treatment. Despite rising landfill costs and taxes, incineration remains financially the more expensive option, particularly if incineration residues fail to meet the waste acceptance criteria. The introduction of tighter regulations concerning the chemical content of potentially hazardous consumer products may render HHW less problematic. The risks associated the various HHW disposal techniques and comparison with landfill to assess the impact of hazards on the environment and human health require further evaluation.