It may be interesting to note that the most likely place an ordinary citizen would encounter arsine is when large banks of lead acid accumulator batteries are charging. I used to be around large submarine batteries on charge and the smell is quite unique. I believe it was a result of the charging process. I believe this is correct - though it may have been stibine producing the odour. Most likely is that both arsine and stibine contribute to the characteristic smell. It is unnoticable when charging small everyday accumulators.  