Does it present any explosion/fire hazard to store large bags of dry fertilizer in those Home Depot buckets with lids ? My husband hates the smell in the garage and we'd like to see if we can reduce that, but don't want to do anything that could cause a fire or explosion.

no idea. I pour the fert. into the coffee cans and the lids would not seal as tightly. I keep them in my potting shed which is open on 3 sides so I don't get the build up of smell. would not want to have a fire hazzard