A great air purifier for a small area such as a bedroom is the IQAir GC Multigas. Getting rid of nasty smells and smoke are easy for this air purifier. Sufferers of allergies will be suited to this unit as it is excellent at removing allergens. The GC Multigas is also good at removing particles as well as gases. There are 3 filter stages (particle pre-filtration, gas absorption and particle post-filtration). The cartridges for the filter can last up to 2 years, meaning that the maintenance is inexpensive. There are six different speed settings allowing you to control the level you need. The on unit control is a 4 key touch panel LCD display.