The only risks for getting HIV is by having unprotected vaginal or anal intercourse with penetration or sharing IV drug needles. Simply touching or smelling blood would not transmit the virus. Air and saliva inactivate it as stated. This is a virus much harder to get than the general public believes. If you are working in a health care setting or lab, then it is important you begin to educate yourself on such matters to work safely and not live in fear from your job. This type of thing is not a risk in any way and the only ways people can get HIV are as stated.
HIV needs a host for transmission. Air can't be a host in this case.
No risk, hiv is a fragile virus and instantly inactivated in air or saliva, so you should move on from this issue.