1. Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, Ontario, M1C 1A4, Canada
2. WECC Wania Environmental Chemists Corp., Toronto, Ontario, Canada
3. Norwegian Institute for Air Research, Fram Centre, Tromsø, NO-9296, Norway
4. Department of Environmental Science, Stockholm University, Stockholm, SE-106 91, Sweden
5. Toxicology and Environmental Research and Consulting, Dow Chemical Company, 1803 Building, Washington Street, Midland, MI, 48674, USA