Systems (1) and methods for determining a personal air pollution dose indicator of an individual (2). The system comprises a portable sensor device (3) carried on by the individual and a distant server (4). The portable sensor device (3) comprises an air pollutant concentration sensor (5), a physical activity sensor (6) and a wireless transceiver (7) to send measurement data to the distant server (4). The distant server (4) comprises a communication module (8) and a computation module (9) to determine an inhaled amount of air by the individual at time t, and determine a personal air pollution dose indicator of the individual at time t based on the inhaled amount of air and a concentration of air pollutant at time t.
