The most tricky indoor air quality issues that must be dealt with care is smell. Many high end air steriliser or air purifier will boast that they are capable of removing odour. This is actually a subjective matter as smell cannot be measure or there is nothing to quantify acceptable or unacceptable.
The equipment maybe capable to handle normal light odour through the use of carbon filters and other accessories. I would like to caution and handle with care as different people may have different perceptions of whether the room smell.
You have to understand where is the source of the smell. It can be due to water damage, moist surface, furniture or others. The Germitrol is one of the reputable air sterliser to remove odour and kills germs and filter out the contaminated air.