Evaluating isolation of a closed space to suspended particulate matters

3. Materials and Methods

The apartment on the 10th floor of a over-20-floor building was constructed by Vinaconex, a national brand name for constructing important projects. The building is under 3 years old and located in the South of Hanoi city. The apartment faces a quiet corner with relatively lower traffic on the ground floor.

One PMS7003 sensor was placed inside plastic box and particulate matters were pulled in for sampling by a constant rate fan. One box was placed inside the room about 70cm above the floor level and the other placed on the balcony with a similar height to the floor. The sampling interval is one minute. The PM2.5 and PM10 outputs are extracted directly from the sensor reading without any calibration.

Data analysis was carried out using Python language with an Jupyter Notebook editor. Graphs were produced using a popular library called Matplotlib. For a cleaner display, data is aggregated into a 10-minutes interval or one-hour interval. Effectiveness of the isolation was evaluated using the ratios of PM2.5 and PM10 of the inside to those of the outside. The ratios to PM2.5 to PM10 inside and outside (I/O) were used to evaluate the particle profiles and the distribution of PM2.5 and PM10.