Can I break my lease because of a horrible smell?

Question Details: I signed a year lease for an apartment approximately 3 weeks ago and got the keys a week and a half ago. When I first toured the apartment everything was great but in the day I got the keys I noticed a bad smell. I figured it was from being hot and closed up but after a few days of cleaning and airing out it was worse. I contacted the landlord and they came out to find a faulty dump pump in the basement and said they fixed it. However, the smell is still there and isn't getting better at all.

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