Is the giant air purifier useful for filtration?

Now PM2.5 is so serious that it really needs an air purifier. It's even better to filter giants. This brand of purifier was launched by Shuangfeiyan, a big coffee maker in the mouse industry. Technology is relatively advanced in the industry. While purifying the air, the exclusive patented filter can be cleaned and reused, and other purifiers have to be replaced regularly. The giant filter will not produce secondary pollution and ozone, at the same time, it can increase negative ions in the air (good for the body) and humidify the air. Technology brand is not simple.