Previous asbestos workers with normal radiography, including chest CT scans, through a literature review have been shown to have significant changes in pulmonary function. This is seen for static and dynamic  parameters  as  well as the transfer factor of the lung for carbon monoxide (TLCO). Much of the literature is of low sensitivity due to the cross-section rather than longitudinal data and selection bias. These effects are greater in those with asbestos-related pleural abnormalities or asbestosis or with both. Many studies document the synergistic effect of smoking with regard to pulmonary function changes, but even dust exposure alone can be seen to lead to changes with negative radiology. Unfortunately, more detailed and sensitive investigations such as longitudinal studies with measurements of TLCO, lung compliance and exercise testing by use of ergospirometry have been very rarely performed or are not available in the study group of interest. Our findings indicate that even sensitive chest CT scanning cannot provide exact lung function data and replace specific pulmonary functional tests. However, by support of AI CT scaLung function impairment due to asbestosnning may become more useful for estimation