Study on the relationship between exposure dose of nitrogen oxides and the length of the time using gas burning equipments

Abstract

We recorded the livelihood time under the circumstances, those are: using gas cooking burner and gas stove going out and in the experiment room and to ventilate by opening the window. While taking these time recordings, the dose of exposure for nitrogen oxides (NOx) to volunteer was continuously measured by the chemiluminescent NO/NO² analyzer.
In order to investigate the relationship between each activity and the exposure dose of NOx, we applied statistical methods such as multiple regression analysis. After that we tried to consider the possibility of evaluating the exposure dose of NOx for general population based on daily activities by means of time budget survey.
The results were as follows:
(1) The statistically significant correlation was observed between the time of using gas stove and NO² concentration (daily average), and it also had the highest contribution ratio for predicting the dose of exposure for NO² by multiple regression analysis.
(2) The time of using gas cooking burner was not markedly related to the dose of exposure for NOx (daily average), contrary to the amount of NOx production.
(3) It seemed difficult to predict the dose of exposure for NO by multiple regression analysis when independent variable was the time spent under each activity.
(4) In order that different approach should be necessary to evaluate the dose ofexposure for NO from the way which can be used in evaluating NO² exposure, the most suggestive way to predict the dose of exposuresuccesfully should be using a personal monitor along with methods above noted.