As far as I know, there's only one nanobody-based drug on the market today, caplacizumab, and it isn't administered through aerosols, but rather subcutaneously.

I know Ablynx was working on an inhaled one as a treatment for RSV, but I don't think it made it to the market (yet). This noveldelivery method probably needs lots of scrutiny from regulators before it can enter the market.