Exposition to Private Material in Class Classes: Case of Jaime Isaza Cadavid Colombian Polytechnic Study

Objective: To evaluate the exposure to inhalable particulate matter (PM10) and respirable particulate matter (PM2.5) in classrooms at the Politécnico Colombiano Jaime Isaza Cadavid (PCJIC) and to assess its relationship with outdoor air quality and surrounding emission sources. Theoretical Framework: PM2.5, recognized by the World Health Organization (WHO) as one of the most critical atmospheric pollutants, is associated with respiratory, cardiovascular, and cognitive impairments. Indoor air quality depends on internal sources, outdoor infiltration, and ventilation conditions. Methodology: A total of 49 classrooms were randomly selected from 162 using probabilistic sampling. PM10 and PM2.5 concentrations were measured between March and May 2023 using gravimetric techniques (NIOSH 0500 and 0600) and data from the MED-PJIC air quality monitoring station. Results and Discussion: Average concentrations were 66 µg/m³ for PM10 and 61 µg/m³ for PM2.5, remaining below occupational exposure limits but exceeding WHO-recommended thresholds. Approximately 90% of measurements were below 100 µg/m³. No statistically significant differences were observed between the mean values of both fractions, suggesting that respirable particles represent a substantial proportion of the total particulate matter within the educational environment. Implications and Originality/Value: This study addresses existing knowledge gaps regarding indoor air quality in educational settings and provides valuable evidence to inform environmental policies and mitigation strategies in urban institutions with high exposure levels.