NO2 concentration | Coef | Std Err. | t | p > |t| | 95% Conf. Interval |
---|---|---|---|---|---|
Period | -13.10 | 2.40 | -5.51 | 0.000 | -17.80 – – 8.30 |
Log traffic | 0.35 | 0.61 | 0.57 | 0.570 | -0.88 – 1.58 |
Low | (reference) | ||||
Intermediate | 7.90 | 3.90 | 2.03 | 0.047 | 0.11 – 15.70 |
High | 18.30 | 4.60 | 3.99 | 0.000 | 9.10 – 27.50 |
Constant | 62.90 | 4.40 | 14.32 | 0.000 | 54.10 – 71.70 |