Preliminary analysis of effects of the 2006 Turin Winter Olympic Games on air quality.

An increasing trend of >160 μg/m 3 class frequency can be observed from the ante-operam period (1.9%) to the in-operam (2.8%) and post-operam (3.7%).

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Lower concentration classes (< 40 μg/m 3 ) do not show a clear trend in frequency.

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This pattern did not emerge from the Milan data, where a decreasing trend can be seen between the ante-operam and the post-operam periods.

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