Personal exposure levels to O₃, NO_x and PM₁₀ and the association to ambient levels in two Swedish cities.

For O 3 , total time spent outdoors, time spent outdoors not in traffic, and time inside were significantly associated with personal exposure to O 3 (time spent indoors was negatively correlated), whereas the association with time spent in dense traffic was also positive, it did not reach statistical significance, possibly because of the complex chemical reactivity pattern of O 3 in dense traffic.

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