| http://www.w3.org/ns/prov#value | - ow about 15 degrees, which Erie County Executive Mark C. Poloncarz pointed out on his Twitter account today.???I just learned from my DPW staff salt is ineffective for the most part when temperature is under 15 degrees,??? he tweeted. ???Explains why roads are slick.???Zaff explained that salt and other chemicals used to melt snow and ice ???have varying degrees of ability to melt snow at various
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