Abstract
A mobile CO2 laser-photoacoustic system which is installed in a trailer for the in-situ monitoring of gaseous air pollutants is presented. The absorption of urban air in the 10.4 µm branch of the CO2 laser is dominated by ethylene (C2H4), CO2 an H2O vapor. The continuous detection of C2H4 is of special interest because C2H4 shows harmful effects on plants even at concentrations below 50 ppb. The first continuous measurements of these three constituents are discussed. The versatility of our mobile system is demonstrated on the basis of diurnal concentration profiles which have been recorded in downtown areas. Good agreement with independent measurements is obtained. The system yields a detection limit of 5 ppb for C2H4 in urban air.
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