  The effects of temperature and humidity on the estimation of air pollution by
benzene by using the piezoelectric crystal gas sensor were studied.
Polyvinylchloride films were used as substrate for the immobilization of
polymethylphenylsiloxane onto the electrode surface of the piezoelectric
crystal. The sensing layer consisting of polymethylphenylsiloxane and
polyvinylchloride was used for real-time monitoring of benzene, one of the
atmospheric pollutants. According to the humidity from 35% to 75%, the upper
limit of detection by this sensor was decreased and the response time and
frequency recovery time for detecting benzene were long. On the other hand, as
increasing the temperature, the response time and the frequency recovery time
of the sensor were short, but its sensitivity got worse. The models for the
correlation between the benzene concentration and temperature (or humidity)
were presented.
