Through the introduction of a new simple cumulative index that is linearly dependent on traffic load and outdoor radon levels (as related to the air mixing condition), it was possible to ascertain the cumulative effect of traffic and atmospheric dilution on PM10 and benzene concentrations in Milan air in the years 2000 and 2001. The proposed methodology will be used to monitor the situation with data collected 10 yr later, in order to evaluate air quality improvement taking into account the influence of different meteorological conditions of the two periods compared.
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