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Considering people's growing curiosity and awareness of indoor air pollution, this study aims to evaluate the Indoor Air Quality (IAQ) of a Korean unlimited grill restaurant. The methodology was adopted from US EPA BASE, with the parameters of dry bulb temperature, relative humidity (RH), carbon dioxide (CO2) concentration, and particulate matter concentrations (PM2.5 and PM10) that mainly influence IAQ. The gathered data were evaluated to different international and local codes and standards: international provisions from ANSI/ASHRAE 62.1 and OSHA; and local provisions from DOLE, DOE, and DENR-EMB. The following equipment were used for the following parameters: Smart Sensor AR 807 and ASHRAE hygrometer (for dry bulb temperature and RH); Vernier CO2 gas sensor (for CO2); and LanBaoDeYuan's LB-S06 formaldehyde detector (for PM2.5 and PM10), with a 2-hour testing for both lunch and dinner. According to the results, overall indoor temperature readings were above the standard temperature; RH readings exceeded its standard except 1.7m indoor level; CO2 concentrations both during lunch time and dinner time were lower in the satisfactory range; and both PM2.5 and PM10 were higher than the ASHRAE 62.1-2016 standard limit but lower than the ACGIH standard limits. [ABSTRACT FROM AUTHOR]