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Nuclear is dangerous than the contaminated air. 
1. The air can be purified naturally by trees whereas we can't do anything with the radio active rays
2. The caskets are not indestructible.  They can break during tsunami, earthquakes or any other way. Once broke and we are done. No life can survive for more than 50 or 100 kms radius for centuries whereas polluted air is just fine and we can survive and we are still surviving.  
3. See the 2001 tsunami that affected the Japan's nuclear reactor. The place itself is abandoned.