Comments on the Respiratory Exposure to Toxic Gases and Metal Fumes Produced by Welding Processes and Pulmonary Function Tests

I read with interest the article recently published in The IJOEM on respiratory exposure to toxic gases and metal fumes produced by welding processes by Mehrifar, et al.1 This paper has reported respiratory symptoms among welders and supported by field measurements of welding gases and fumes. However, there are certain issues that need to be addressed.