«We have expanded our air quality monitoring network with new low-cost sensor technology to improve coverage by incorporating other strategic sites,» reported the Ministry of the Environment and Natural Resources (MARN).

According to the institution, there are now eight monitoring points in total, of which three are reference stations located in the Metropolitan Area of San Salvador, and five low-cost sensors have been added, of which two are in San Miguel, one in Santa Ana, one in Sonsonate, and one in La Unión.

«The new monitoring equipment is optical sensors, which allow us to know the trend of air quality in other cities in the country and in the San Miguel volcano’s surroundings,» explained MARN.

According to the institution, with the installation of the new sensors, it will be possible to obtain data on carbon dioxide and three sizes of particulate matter PM10, PM2.5 and PM1.0, in addition to reporting information on temperature, relative humidity, and atmospheric pressure.