Yes, mothballs contain naphthalene, which is a poison if inhaled.
Possibly in high enough concentrations. Baby clothes should not be kept in any area with mothballs. Generally mothballs are only needed to protect clothing not used routinely.
strong aromatic odour
It can be, but it would take a massive amount. In an ordinary workplace, i am inclined to believe it is something else. What use would they have for mothballs?
Lime is not dangerous to smell in small amounts. Lime can harm the skin if touched and cause problems if ingested.
Lime neutralizes just about anything, but mothballs should not be under your deck.
In a recent Mythbusters, it was determined to be "plausible" that mothballs can actually increase your car's mileage. If mothballs were placed in your gas tank, I suspect you would smell the scent mothballs as they dissolved and then burned. It doesn't sound like mothballs would "spike" your tank. How can you tell if your tank has been spiked? If you cannot tell, it probably doesn't matter.
The smell
Mothballs could create some of the odor.
The smell of mothballs can be difficult to get rid of but heating up the area for a few hours to release odors, then airing out the area is one way that can help. Cleaning the area with vinegar and baking soda and using charcoal to help absorb the smell are other ways to rid your home of the smell.
Put Olive oil on it every day for 3 days, and the smell should leave.
Because they can be fatal if ingested, mothballs are not a safe choice to deter cats. Two safer alternatives are vinegar and ammonia.
It is usually mothballs as many of the clothes were stored for a long time with mothballs and the odor permeates other clothes.