This indicator tracks annual average hourly readings of fine airborne particulates (referred to as PM2.5) from monitoring stations in the region. Data are acquired from the BC Ministry of Environment’s air data archive and processed using Ministry of Environment guidelines. Sources of fine particulate matter include wildfires, residential wood burning, agriculture and unpaved roads. High concentrations of PM2.5 can have negative effects on human health and the environment. Because the particles are small enough to enter the deepest part of human lungs, PM2.5 can cause respiratory problems and contribute to cardiovascular disease. Fine particulates can also impair visibility, affect the climate and damage property (BC Lung Association, 2013).