This document analyzes air quality data from 255 stations in East Texas, focusing on the correlation between ozone, nitrogen oxides, elevation, and temperature. Statistical analysis methods like zonal statistics, ordinary least squares regression, and geographically weighted regression show that nitrogen and elevation are highly correlated with ozone levels in the study area, though temperature does not have global significance across the entire region. The small size of the study area and data inputs limit the conclusions that can be drawn.

1. Air Quality Analysis in East Texas
Milad Korde
Geo 5418 spring 2016

2. • 255 Active Stations
• 127 for ozone
• 64 for nitrogen
• 55 for Study area

3. The correlation
among:
• Ozone
• Nitrogen oxides
• Elevation
• Temperature

6. Distribution of ozone and nitrogen oxides

7. Zonal Statistics in base of counties

9. Zonal Statistics with Standard Residual

10. Geographically Weighted Regression
But first: Ordinary Least Squares
Best candidates: Elevation and NOx

12. Conclusion
● Some variables such as temperature are not globally significant in the study area.
● The data registers a clustered shape mainly caused by the outliers.
● Running OLS with variable Mean temperature caused an unsuccessful result.
● Nitrogen and elevation are highly correlated to the amount of ozone in the study area.
● the study area as well as the input data are relatively small.