Gas-sensing detector gets measure of toxic gasses

This new air quality monitoring system uses laser technology to detect the smallest amount of toxic gasses in large, densely populated regions.

With multiple sensors connected to form a gas analysing network, the units can spot trace amounts of numerous gasses – including nitrogen dioxide (NO2), sulphur dioxide (SO2), carbon monoxide (CO), ozone (O3), and particulate matter – in real-time in dynamic environments.

The World Health Organisation estimates that 4.2 million people die prematurely from the high levels of toxic gas molecules and particulate matter they inhale from ambient air pollution.

Currently, methods for assessing air quality in urban environments rely on expensive, refrigerator-sized units. Low-cost sensors rely on chemical reactions, which are inaccurate and can give false readings.

The €6.9m PASSEPARTOUT project aims to provide a compact detector with a complete understanding of the types and concentrations of toxic gases at a cost of under €1,000.

In a statement, PASSEPARTOUT project coordinator Dr William Whelan-Curtin said: “The miniature PASSEPARTOUT hyperspectral optical-based sensors will provide a comprehensive approach to understanding urban air quality. To have a widespread network and to take meaningful steps towards a smart city, current, expensive methods are not feasible.