A wearable air quality monitoring system that makes use of a complementary range of sensing technologies to provide a complete and reliable assessment of the air quality in the immediate vicinity of the wearer.

Electrochemical cells, a laser optical particle monitor, temperature and humidity sensors are included in the system, which also incorporates a highly-sensitive GPS receiver and 3 axis accelerometer. A microphone is fitted to monitor ambient noise. A basestation provides a docking unit to store the sensor unit at night and to allow access to a regulated 12V supply to power the battery charging circuit.The basestation is fitted with a GPRS modem, patch antenna and SIM card, which are used to transmit the data that are saved on the unit during the day to a central monitoring site.

● accurate electrochemical cells (Alphasense A4) monitoring CO, NO, NO2, and O3. Other sensors available on request.

● optical particle counter (Alphasense).

● temperature and relative humidity sensor (Atmospheric Sensors).

● MEMS 3-axis accelerometer to detect movement.

● GPS module with integrated antenna

● microphone to detect ambient noise level.

● high-capability 32-bit ARM microcontroller.

● bi-colour LED to indicate battery state-of-charge and correct operation of the unit.

● battery and compatible charger circuit to give 24 hours running and some contingency (two 18650 lithium-Ion cells).

● SD Card storage up to 32GB.

● supplied with a shoulder strap and belt clip so can be worn in different ways.