Dry-process photocopying machines can produce emissions of ozone,volatile organic compounds and particulate matter(with an aerodynamic diameter less than 10 ìm).These pollutants can potentially have a significant impact on indoor air quality in office's environment.However,when the outdoor levels of one or more pollutants are high,such as is the Mexico City Metropolitan Zone(MCMZ),the indoor air quality can be deviated from the expected value.The ozone air quality of the MCMZ is recognized as one of the worst air pollution problems in the world.The poor air quality in the MCMZ is well reflected in the number of the exceedences(in hours)and number of days above the Mexican Ozone Air Quality Standard(MOAQS).The interest of this research,is to find the possible impact on the indoor air quality from the operation of photocopying machines located in a room not equipped with an air exchange mechanical system,as well as to evaluate the influence from the outdoor levels of ozone.Furthermore,the contribution of photocopying activities on ozone indoor air quality should be considered as a potential hazard to the health of the operators.The photocopying machines room is located on the first floor of a building of the National University of Mexico,in southwest MCMZ.The results show that,during the period 09:00-15:00 hrs.,the indoor air quality exceeds the Mexican air quality standard for ozone(0.11 ppm which must not to be exceeded more than one hour a day,one day a year)most of the time.Higher ozone peaks were observed from the 09:00 hr to 12:00 hr,due to the activity of the photocopying machines operation;after the 12:00 hr.,ozone levels were influenced both by indoor activities(photocopying)as well as outdoor infiltrations during workdays.
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