After realizing that MOST car air purifiers have ionisers or the CADR is really VERY poor, we decided to develop our own and finally we have a car air purifier that actually works. The filter on this removes 99% of particulate matter (PM2.5). The fan is one of the largest that we could put in a car air purifier. The air inside the car is as unhealthy as the air outdoors. Most powerful car air conditioners do not filter the air that is being circulated inside. The BreatheEasy Car Air purifier is specifically designed for a car and this filter can effectively remove PM2.5 (suspended particles with diameter of 0.3- 2.5 ?m such as inhalable particles, oil smoke, dust, pollen etc.). It also reduces odors such as pet odor, human odor, food odor, smoke odor and others. This Compact Purifier can be easily placed on the front dash or at any other convenient place inside the cabin. It also includes a USB port for charging phones. In our tests, we found that PM2.5 is reduced by about 70% in 18-20 minutes of operation (with recirculation on) For better performance of the Car Air Purifier, it requires maintenance on a regular basis. When cleaning the purifier, please ensure that the machine is off. Wipe the machine using just a dry soft cloth. It is recommended to clean the filter once a week with a mild vacuum cleaner or brush.