The article presents a new tool for environmental analyses concerning pollutant emissions, i.e. the I-EcoWelding software programme. This Internet guidance system is an innovative tool supporting the decision-making related to health and safety in production processes and supporting calculations of pollutant emissions into work environment during welding and allied processes. The Internet guidance system helps determine emissions and compositions of welding fumes during fusion welding, resistance welding, vibration welding of thermoplastics, brazing as well as thermal gas and plasma cutting. In addition, the system enables calculating emissions in relation to the entire welding production of a given company, taking into consideration the duration of a technological process or the declared weight of filler metal used.