At present, the purification technology of particulate matter in the air is relatively mature. A professional testing agency has tested and evaluated different types of air purification products, and conducted field experiments in offices and households. The results show that the PM2.5 mass concentration can be reduced in offices and homes using air purifiers.

The purification time required by some purifiers with good performance is shorter, such as 1 hour, which can reduce indoor PM2.5 concentration by more than two-thirds. Closing doors and Windows in polluted weather, air purifiers can reduce indoor PM2.5 concentration to a certain extent.

First, understand the purification principle of air purifier

There are many types of air purifier working principle, such as filtration, electrostatic adsorption, chemical reaction and multiple types of combined purification, filtration refers to the air pumped into the machine by the fan, through the built-in filter filter air, can play a certain role in filtering particles, toxic and harmful gases and some bacteria.

Chemical reaction refers to the effective purification of indoor air through all sorts of chemical reaction technology, such as technology of silver ion, anion, photocatalyst. Multiple purification refers to the combination of filtration technology and various chemical reactions and other technologies. The existing air purifiers mostly use multiple purification technology.

Two, the new requirements of the new national standard of air purifier

The newly revised national standard of air purifier "Air Purifier" (GB/T 18801-2015) has been formally implemented. The new NATIONAL standard has clarified several core indicators that affect the purification effect of air purifier, namely CADR value (clean air volume), CCM value (cumulative purification volume), energy efficiency grade and noise standard. The higher CADR value, It indicates that the faster the purification efficiency is, the higher the CCM value is, indicating that the more pollutants are purified by the filter element of the air purifier in its life.

These two indicators reflect the purification capacity and purification continuity of an air purifier, which is the key to judge the quality of an air purifier.

In addition, the specific requirements for the applicable area, the requirements for the release of harmful substances, the evaluation method of small air purifier, the evaluation method of air duct type purification device are also given.