Samples were collected at a height of 2.8 m above ground level at Coles Place, a residential site 1 km north of the city center.In November 2000 sampling took place at nearby Packe Street site, both sites being situated in purely residential areas and well away from busy roads.Meteorological data: collected by Environmental Canterbury at the Coles Place sampling site (wind speed, wind direction, temperature, humidity, and rainfall).