Calibration of Sensor Network for Outdoor Measurement of PM2.5 on High Wood-Heating Smoke in Temuco City

Carlos Muñoz Poblete; Huircan, Juan Ignacio; Francisco Jaramillo Montoya; Álex Boso

Keywords: air pollution, low-cost sensor, particle-matter calibration, spatial–temporal distribution

Abstract

In order to ascertain the spatial and temporal changes in the air quality in Temuco City, Chile, we created and installed a network of inexpensive sensors to detect PM2.5 particulate matter. The 21 measurement points deployed were based on a low-cost Sensiron SPS30 sensor, complemented with temperature and humidity sensors, an Esp32 microcontroller card with LoRa and WiFi wireless communication interface, and a solar charging unit. The units were calibrated using an airtight combustion chamber with a Grimm 11-E as a reference unit. The calibration procedure fits the parameters of a calibration model to map the raw low-cost particle-material measurements into reliable calibrated values. The measurements showed that the concentrations of fine particulate material recorded in Temuco present a high temporal and spatial variability. In critical contamination episodes, pollution reaches values as high as 354 µg/m3, and at the same time, it reaches 50 µg/m3 in other parts of the city. The contamination episodes show a similar trend around the city, and the peaks are in the time interval from 07:00 PM to 1:00 AM. In the winter, this time of day coincides with when families are usually home and there are low temperatures outside.

Más información

Título de la Revista: PROCESSES
Volumen: 11
Número: 8
Editorial: MDPI Open Access Publishing
Fecha de publicación: 2023
Página de inicio: 1
Página final: 15
Idioma: Ingles
URL: https://www.mdpi.com/2227-9717/11/8/2338
DOI:

10.3390/pr11082338

Notas: WOS