Patent ID: 7857892

Claim:
An air pollution sensor system ( 1 ) incorporated in an enclosure (E), said enclosure comprising: an air handling system inside an air duct ( 2 ), said air duct enabling a communication between air inside said enclosure and air outside said enclosure, said air duct comprising an air inlet for receiving air and an air outlet for releasing handled air inside said enclosure, wherein said air pollution sensor system further comprises; at least one particle sensor ( 21 ) for: sensing particles with a diameter in a range of approximately 5-2500 nm, inside said enclosure, said particle sensor comprising: (a) an inlet section ( 200 ) capable of receiving an input influx airflow with charged and uncharged airborne UFPs, and (b) a precipitation section ( 202 ; 301 ) capable of receiving said charged and uncharged airborne UFPs and performing an electrostatic particle precipitation or particle filtration step to capture at least part of said charged airborne UFPs and delivering an output airflow that is at least partially denuded of said charged airborne UFPs, wherein said precipitation section ( 202 ) comprises a second flow conduit ( 217 ) present between at least two cylindrical-concentric and/or parallel-plate electrodes ( 218 , 219 ) capable of applying a high electric field across said second flow conduit, one of these two electrodes being connected via a current meter ( 221 ) to earth potential; and providing a pollution information signal (P) in response to the sensing of said particles.