Would an air purifier help with the smell?

Hi Fernan, I live in Massachusetts, and I decided to put a purifying system on my 4 unit rental property and I am very happy with it.

I have not tried this but an HVAC company suggested UV lights installed in the ductwork or near the AC coil, but I also see stand alone ultraviolet air purifier by googling. 

Ozone machines are horrible for you and can cause health issues.http://www.epa.gov/iaq/pubs/ozonegen.htmlGet a fogger and use a water based air cleaner and an air purifier.

Also I forgot to mention: Get an air purifier and air purifying plants for your room.

I have serviced them in my pool business.As an air p urifier, I would be worried.

Buy your tenant a "Smoke Eater Purifier;" it's not a cure but it does help.3. 

There's not much ventilation so I thought about adding vent fans or windows to the hallways and stairwells as they all have at least 1 exterior wall.A cheaper and easier solution I thought might be a commercial grade air purifier in each hallway and some plug in air fresheners.Every room has 2 vent fans, a window, and a through the wall air conditioner so the rooms have good ventilation but the hallways can get stagnant, especially in the summer when it is hot(no a/c in the hallways and stairwells).Any suggestions that don't cost a fortune? 

There's not much ventilation so I thought about adding vent fans or windows to the hallways and stairwells as they all have at least 1 exterior wall.A cheaper and easier solution I thought might be a commercial grade air purifier in each hallway and some plug in air fresheners.Every room has 2 vent fans, a window, and a through the wall air conditioner so the rooms have good ventilation but the hallways can get stagnant, especially in the summer when it is hot(no a/c in the hallways and stairwells).Any suggestions that don't cost a fortune?

From my understanding they are like a super air purifier.