By CBC News Ottawa, August 21, 2015
Fireworks shows that used to take place over Lac Leamy for years caused some
higher concentrations of heavy metals and other contaminants, but not enough to
be considered a risk to the people who swim or boat there. Documents obtained by
Radio-Canada show the National Capital Commission was interested in the impact
the fireworks were having on the lake and beach. via
Years of fireworks caused above-normal amounts of heavy metals in Lac Leamy -
Ottawa - CBC News.