Pitt Meadows Airport (YPK) is under fire for its tolerance of aircraft that still use leaded fuel. A UBC professor is urging the airport to monitor lead emitted from aircraft fuels, and move to cleaner alternatives. Dr. Paul Kershaw has appeared before Pitt Meadows city council to raise his concerns. He is a Pitt Meadows resident of 22 years, and a prof in the UBC School of Population and Public Health. The U.S. is moving toward phasing out lead…