Carbon Monoxide Concentrations in Kitchens of Gas-fired Burners, Karachi, Pakistan

In this study, gas-fired kitchens of 54 bungalows and 25 apartments were studied using stationary indoor carbon monoxide (CO) monitoring. The levels of CO were measured in each kitchen for a period of 24 h with a 1 min resolution using data logger EL-USB-CO300. Hourly, 8 h and 24 h, CO means for all the kitchens were calculated. Hourly and 24 h CO means of kitchens for bungalows were 3.72[+ or -]6.26 ppm and 3.72[+ or -]3.16 ppm, respectively, while those apartments have 3.74[+ or -]6.96 ppm and 3.74[+ or -]2.17 ppm, respectively. 8 h CO means of night, day and evening in the kitchens of bungalows were 2.62[+ or -]3.22 ppm, 4.85[+ or -]4.66 ppm and 3.53[+ or -]3.30 ppm, respectively, while in apartments 2.13[+ or -]2.02 ppm, 3.79[+ or -]3.86 ppm and 5.29[+ or -]4.17 ppm. The mean difference between the 8 h CO concentrations during the evening in bungalows and apartments was 1.76[+ or -]0.87 ppm (P