Study of the association between nitrogen oxides and ozone concentration with meteorological parameters

Abstract

The present study investigates the relationship between both the ozone concentration (O3) and nitrogen oxides (NOx = NO + NO2) as a function of meteorological conditions for the atmosphere of Campo Grande, MS, from January to December, 2015. Daily as well as seasonal effects of pollutant gases were investigated and compared using results of time series analysis. The O3 and NOx diurnal cycles are inversely related to the superficial O3, which presents peaks at noon and lower nocturnal concentrations. The results show that the maximum concentrations of O3 and oxidants (Ox = O3 + NOx) in Campo Grande usually appear in the early afternoon, around 3:00 p. m. The daily variation of NO concentration shows a very clear cycle with two peaks, the first one appearing around 07:00 a.m. and the second at 11:00 a.m. At the lowest level of NOx, NO2 is the main component, while NO dominates the highest blend rate. Strong positive correlations were observed between O3 and temperature and between O3 and solar radiation, as well as a strong negative correlation was observed between O3 and the relative humidity of the air, during the studied period.

Keywords

• Óxidos de nitrogênio
• Ozônio
• Sazonalidade
• Tendência