Many of us have to breathe to stay alive. Okay, all of us have to breathe to stay alive. Some of us just need cleaner air than others, or our ability to think and function is severely impaired from inhaling common pollutants found in both outdoor and indoor air.
This is where air purifiers and filtration devices come in.
Here are links to a few good documents and websites to read before you spend any money, that discuss what to look for and what to avoid: