The purpose of this screening study is to assess spatial and temporal variations in oxidative stress, PAH, kinones and nitro-PAH in PM10 samples from rural, urban and traffic sites. One important question is if there is any relation between toxicity and concentrations of PAH, kinones and nitro-PAH. Other pollutants measured at these sites, like ozone, black carbon, PM10 and particle number concentration, will also be included in the evaluation.
