The paper presents a computational analysis of the PMV, PPD and PD thermal environment indices for indoor air quality (IAQ) inside a historic wooden church in the village of Wiśniowa. The study is based on annual measurements of indoor air parameters as well as data on the number of Sunday Mass attendees and indoor air quality. As the results point out, indoor thermal comfort during the ma-jority of Sunday Masses, both in summer and winter, remains within category C while the indoor air quality, assessed by means of PD index, levelled at 100%, ir-respective of time of year. The improvement of inside air comfort and hygienic standards is possible by means of installing an effective mechanical ventilation system adapted for use in a historic building of high value in terms of local mate-rial culture. ...
