How to choose air purifier?

1 air purifier without ozone

2 air purifier with little ozone (UV-light)

3 ozone machine

Air purifiers wihtout ozone filter solid pollutants (PM10, PM2.5, and other solid particulate matter) and gaseous pollutants (ammonia, volatile organic compounds TVOC, etc.) in the air including some virus, only filter

Air purifiers with ozone filter solid pollutants at the same time, in which ozone works as a kind of disinfect to kill virus and bacteria. please note that ozone out of air purifier is very little, less than 0.05ppm at the 50mm from outlet after working 24 hours, China air purifier safe standard for CO3 from air purifier

The ozone generator is specialized in producing ozone to kill bacteria, viruses and other microorganisms

To sum up, air purifier is the physical way to filter microorganisms to purify the air, out of which ozone can be ignored as it is nothing. while ozone machine only produce ozone to disinfect, sterilize, remove odor, smell, smoke etc, from 1mg, 3mg, to 500mg, 1kg, 100kg per hour. According to your necessary like requirement for CT value, you can choose ozone machine or ozone system. and that ozone is a chemical method

To generate ozone has 3 types methods, UV-light is one of them, other two are corona discharge and electrolysis water