ANALYSIS OF NOX, NO AND NO2 AMBIENT LEVELS AS A FUNCTION OF METEOROLOGICAL PARAMETERS IN DHAHRAN, SAUDI ARABIA
Free (open access)
77 - 86
KHALED GASMI, ABDULAZIZ ALJALAL, WATHEQ AL-BASHEER, MUMIN ABDULAHI
NOx, NO and NO2 concentrations, and meteorological parameters, temperature, wind speed, relative humidity and pressure were measured simultaneously and continuously in Dhahran (Saudi Arabia) during three months in summertime. The hourly and daily NOx, NO and NO2 average concentrations were investigated as a function of the meteorological parameters. NOx, NO, and NO2 were found to have a common source and to be highly influenced by traffic emission and meteorological conditions, and the trend of NO showed a higher concentration during weekdays than weekends. NOx has significant positive correlation coefficients with NO and NO2, respectively. Similarly, NO2 also has a positive correlation coefficient with NO. The temperature and wind speed showed negative correlation coefficients while relative humidity showed positive correlation coefficient with NOx, NO and NO2. On the other hand, NO2 was found to exceed international air quality standards, which indicates the existence of a possible NO2 air pollution problem in Dhahran.
NOx, NO, NO2, traffic emission, meteorological parameters