Hydrocarbons in the cab of an automobile were measured during trips on the New Jersey Turnpike and

Question:

Hydrocarbons in the cab of an automobile were measured during trips on the New Jersey Turnpike and trips through the Lincoln Tunnel connecting New York and New Jersey.10 The concentrations standard deviations) of m- and p-xylene were
Turnpike: 31.4 ± 30.0 μg/m3 (32 measurements)
Tunnel: 52.9 ± 29.8 μg/m3 (32 measurements)
Do these results differ at the 95% confidence level? At the 99% confidence level?