Accurate monitoring of indoor mass concentrations of particulate matter is very important for health risk assessment as people in developed countries spend approximately 90% of their time indoors. The direct reading, aerosol monitoring device, Turnkey, OSIRIS Particle Monitor (Model 2315) and the European reference low volume sampler, LVS3 (Sven/Leckel LVS3) with size-selective inlets for PM 10 and PM 2.5 fractions were used to assess the comparability of available optical and gravimetric methods for particulate matter characterization in indoor air. Simultaneous 24-hour samples were collected in an indoor environment for 60 sampling periods in the town of Bor, Serbia. The 24-hour mean PM 10 levels from the OSIRIS monitor were well correlated with the LVS3 levels (R 2=0.87) and did not show statistically significant bias. The 24-hour mean PM 2.5 levels from the OSIRIS monitor were moderately correlated with the LVS3 levels (R 2=0.71), but show statistically significant bias. The results suggest that the OSIRIS monitor provides sufficiently accurate measurements for PM 10. The OSIRIS monitor underestimated the indoor PM 10 concentrations by approximately 12%, relative to the reference LVS3 sampler. The accuracy of PM 10 measurements could be further improved through empirical adjustment. For the fine fraction of particulate matter, PM 2.5, it was found that the OSIRIS monitor underestimated indoor concentrations by approximately 63%, relative to the reference LVS3 sampler. This could lead to exposure misclassification in health effects studies relying on PM 2.5 measurements collected with this instrument in indoor environments.
Bibliographical noteFunding Information:
This work is supported by a Grant from the Ministry of Education and Science of the Republic of Serbia , as a part of Project III-42008: “Evaluation of Energy Performances and Indoor Environment Quality of Educational Buildings in Serbia with Impact to Health”, within the framework of the Technological Development Program.
Copyright 2012 Elsevier B.V., All rights reserved.
- Aerosol monitoring
- Exposure assessment
- Indoor air pollution
- Optical monitor
- Particulate matter