If the apartment was advertised as being in a peaceful, green area and the pitch surrounded the view, etc., then its possible you have a claim to abate or terminate the lease, or obtain a reduction in rents for compensation.
It is also possible that this constitutes a violation of your rights to quiet use and enjoyment, especially because the parking lot is being used in a manner not permitted by the state, county or municipal governments.
Also, every lease has two implied conditions: (1) good faith and fair dealing (which means LL will not interfere with the performance of the lease) and (2) quiet use and enjoyment. If the landlord puts a nuisance right outside your window, then its definitely a violation of (2).
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You may have a claim. Much of it will depend on how long ago your landlord made the change. For example, if you "lived with it" for 9 months and are only now protesting, you will probably have a weaker case than if your landlord just made the parking change.
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