The present invention has an object to provide a production method of acrolein capable of producing acrolein with suppressing the yield change with time. Deployment of the airbag is controlled based at least in part on the pressure in the chamber measured by the pressure sensor. An optimized APD reverse-bias voltage is then determined by reducing the reverse-bias voltage at which avalanche breakdown occurs by a predetermined offset voltage. In addition, critical nodes may be used to define critical regions.