The biggest problem is from ice resurfacers. These emit carbon monoxide, nitrogen dioxide and particulate material, mostly from the fuel. There is a new trend toward fake ice rinks, which are made of a thin layer of polyethylene coated with propylene glycol. This is apparently recyclable since it is plastic but is easier for upkeep and has lower emissions. Zero-emissions resurfacers are also in the mix: http://wx.toronto.ca/inter/it/newsrel.nsf/11476e3d3711f56e85256616006b891f/650ac2e30e6ad1f18525751900539a99?OpenDocument
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