Aim: Concentration of formaldehyde (FA) which is used to preserve cadavers for dissection in medical colleges was monitored in indoor air including at the breathing level in dissection classes during a 2-week study in a gross anatomy laboratory and also in the cadaver storage room in a Medical College in India in 2012. Materials and Methods: Air samples were collected for 30 min and 3 h to commensurate with World Health Organization (WHO) standard (short-term exposure limit) value of FA (30-min) and dissection class of 3 h duration respectively. Results: FA concentration ranged from 0.11 to 1.07 mg/m 3 in the cadaver storage room and 0.06-1.12 mg/m 3 in the gross anatomy laboratory. In samples taken at 5 ft height at the breathing level, FA concentration ranged from 0.32 to 0.86 mg/m 3. Conclusions: Most of the observed FA levels were found to be above the prescribed FA guideline values laid down by organizations such as OSHA, ACGIH, WHO, Japan Ministry of Health, Labor, and Welfare and, therefore, could be considered as harmful for students' and teachers' health. FA concentrations reported from a few medical facilities in other countries are comparable, implying that some uniform management and control strategies for FA could be contemplated to reduce risks of FA exposure to students and teachers which are discussed in this paper.

Air change rates and ventilation of a room was determined by CO Tracer Decay Technique. The tracer was generated by burning bulk amount of mosquito coils, an easy and low cost method of CO generation. The temporal decay in CO concentration in indoor air under closed and open room conditions were determined by collecting indoor air periodically at a few minutes interval in Tedler Bags and analyzing the same for CO. The air changes rate per hour (ACH) was calculated from the temporal decline of indoor CO concentration in indoor air. The study indicated that CO generated by a low cost and easily applicable method like combustion of organic materials could be used as a tracer to determine ACH and ventilation rate. Background CO in air could be suitably used for ventilation studies in rural/urban slum dwellings in India and many other countries where substantial CO is found indoors due to combustion of biomass, incense sticks and mosquito coils.