C17

Question 1

IR based breathalysers

Answer 1

they pass a beam of IR radiation though captured breath in sample chamber
detect IR absorbance of compounds in breath e.g. ethanol
mote IR radiation detected could mean more ethanol / alcohol in breath

Question 2

IR spectral fingerprints to identify pollutants

Answer 2

Remote sensors analyse IR spectra of vehicle emissions

detect and measure CO, CO2 and hydrocarbons in busy town centres and motorways

monitor pollution in cities