For people living at South East Asia, click here to find out whether haze is happening at your area:
At home, we have low end model air purifier Sharp and Hitachi. In my opinion, it's not crucial to get a high end air-purifier model as the most important function is to absorb dust. However, you can opt to get a high end air purifier if you have a bigger budget.
Also, we have one humidifier from OSIM call uMist.