7.4.4 Electrochemical Sensors for Environmental Monitoring in Cities

14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
Nürnberg/Nuremberg, Germany
7.4 EU NetAir (Special Session) II
O. Popoola, G. Stewart, R. Jones, I. Mead - Centre for Atmospheric Science, Department of Chemistry, University of Cambridge (UK), J. Saffell - Alphasende, Sensor Technology House (UK)
640 - 640


We demonstrate that miniature, low-cost electrochemical gas sensors, traditionally used for sensing at parts-permillion (ppm) mixing ratios can, when suitably configured and operated, be used for parts-per-billion (ppb) level studies for gases relevant to urban air quality. The results show the sensors to be high precision and highly linear in the ppb rangeand in general highly selective, although there are some significant cross-interferences. Comparisons of the sensors with co-located reference instruments show good agreement on both short and long timescales, demonstrating their utility for urban air quality monitoring.We have also integrated multiple sensors with GPS (location) and GPRS (real time data transmission) to create multi-sensor nodes fordeployment as components of
sensor network systems. These have been deployed in substantial numbers as both mobile and static networks systems, providing unprecedented real time spatial and statistical information on urban air quality. We have demonstrated the utility of electrochemical sensors to provide air quality measurements traditionally viewed as only achievable by costly and sparse fixed site monitoring stations. We have shown that this technology can also achieve measurement densities, ready scalability, portability and low cost unachievable by current fixed site networks which collectively promises to add hugely to the capability for monitoring urban air quality for legislation and personal exposure.