Abstract

Short-term daily public exposure to fine particles (median diameter <2.5µm) and ultrafine particles (<0.1 µm) in ambient air has been linked to oxidative stress, bronchial irritation and inflammation, decreased lung capacity, respiratory symptoms and, especially, the exacerbation of chronic respiratory problems such as asthma and other obstructive lung disorders.

Although many workers are exposed to high concentrations of respirable particles larger than 4 µm – including fine and ultrafine particles (UFP) – the respiratory effects of daily exposure in industry have not been studied as much as the effects of chronic exposure.

Daily exposure may induce physiological effects (e.g. pulmonary inflammation and decreased lung functions) in some workers. If exposure is repeated over long periods, the effects may increase the risk of developing chronic respiratory problems.

This study aims to examine the relationships between the daily variation in worker exposure to fine/ultrafine particles in various work environments and the daily variation in pulmonary functions and inflammation. The results can be used to develop measures for limiting worker exposure and thus reducing lung damage.