Clinical study on the relationship between exposure to ultrafine particles (PM<sub>0.1</sub>) and cardiovascular diseases in petroleum workers.

The Cd (ng/mL) levels in the blood of exposed workers were significantly higher than those in unexposed individuals, with mean values of 85.8 ± 0.83 versus 43.7 ± 3.07, respectively; differences were highly significant (p ≤ 0.0001).

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