An overview of air quality monitoring based on low-cost electronic sensors in Cameroon

Abstract This work presents a review of various air quality monitoring carried out in several cities in Cameroon, using locally developed low-cost sensors (€80–150). The objective is to understand air quality and assess health risks at an economically acceptable cost. This work details the design and use of electronic devices based on the IoT, as well as the measurement and evaluation of air quality in different cities in the country. These basic devices, realized and calibrated, made it possible to carry out comparative analyses and validate their accuracy and reliability against reference equipment. Industry, technological innovation and the fight against climate change included in Sustainable Development Goals (SDGs) 9, 12 and 13 of the World Health Organization (WHO), are presented in this article. Pollutants such as CO, CO 2 , NO 2 , SO 2 , O 3 , and PM 2.5 are measured, and air quality indices (AQI) and air quality health (AQHI 2.5 ) are assessed and presented. Air quality is acceptable in the cities of Martap, Minim, Ngaoundéré, Yaoundé and Baham with an AQI ranging between 0 and 100 and less acceptable for sensitive people in the cities of Bandjoun, Douala, Kribi and Bayangam with AQIs above 100, as pollutant values in these cities exceed the WHO standard threshold.