The document summarizes recent high PM 2.5 events in Burlington, VT on February 19-20 and March 1, 2004. Monitoring data showed PM 2.5 levels over 100 ug/m3, which was the highest in New England but similar levels were seen in Southern Quebec. High nitrate levels were also observed in other locations along the Northeastern US and Canada around the same times. Transport of air pollution along the US-Canada border likely contributed to the high PM 2.5 levels measured, in addition to local stagnation conditions. Reports of dust, haze and discolored snow provide evidence that dust from Texas and Mexico was transported and deposited.