A vehicular airborne particulate matter detection system, comprising: a first particulate matter concentration sensor (106, 108) positioned in a passenger space of a vehicle, the first particulate matter concentration sensor (106, 108) configured to generate a first signal associated with an airborne particulate matter concentration in the passenger space; a second particulate matter concentration sensor located outside of the passenger space and configured to generate a second signal associated with airborne particulate matter concentration outside of the passenger space, a user interface; a memory including program instructions stored therein; a controller operably connected to the first particulate matter concentration sensor (106, 108) and the second particulate matter concentration sensor, the user interface, and the memory and configured to execute the program instructions to obtain the first signal, obtain the second signal, establish an airborne particulate matter concentration threshold based upon the obtained second signal, identify a cyclical particulate matter concentration pattern based upon the obtained first signal and the established airborne particulate matter concentration threshold, classify the cyclical particulate matter concentration pattern as a smoking event, and generate an output using the user interface based upon the classified smoking event. a first particulate matter concentration sensor (106, 108) positioned in a passenger space of a vehicle, the first particulate matter concentration sensor (106, 108) configured to generate a first signal associated with an airborne particulate matter concentration in the passenger space; a second particulate matter concentration sensor located outside of the passenger space and configured to generate a second signal associated with airborne particulate matter concentration outside of the passenger space, a user interface; a memory including program instructions stored therein; a controller operably connected to the first particulate matter concentration sensor (106, 108) and the second particulate matter concentration sensor, the user interface, and the memory and configured to execute the program instructions to obtain the first signal, obtain the second signal, establish an airborne particulate matter concentration threshold based upon the obtained second signal, identify a cyclical particulate matter concentration pattern based upon the obtained first signal and the established airborne particulate matter concentration threshold, classify the cyclical particulate matter concentration pattern as a smoking event, and generate an output using the user interface based upon the classified smoking event. obtain the first signal, obtain the second signal, establish an airborne particulate matter concentration threshold based upon the obtained second signal, identify a cyclical particulate matter concentration pattern based upon the obtained first signal and the established airborne particulate matter concentration threshold, classify the cyclical particulate matter concentration pattern as a smoking event, and generate an output using the user interface based upon the classified smoking event.