Conclusions

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Based on the analysis, we found that there is a downward linear trend in pollution year over year. NO2 pollution appears to be decreasing overall.

Visually we can conclude that the South region is different than the Northeast and West regions. However, the results of the T tests revealed that, with a significant value of 0.05%, we can statistically reject the null hypothesis. The regions are not the same in terms of NO2 pollution average.