The main difference between Desktop air purifier with HEPA filter and negative ion generator is the way to remove air impurities.
Desktop air purifier with HEPA filter captures pollutants as the air passes through a high-density physical filter, then delivers clean, fresh air indoors. This process is repeated after the product's power switch is turned on, keeping the indoor air free of contaminants. If new impurities enter the room (such as smoke), the device will drag these particles through the filter and prevent them from returning to the room.

Negative ion generators bind harmful particles by releasing charged ions into the air. After binding, these particles become so heavy that it is difficult to remain in the air. The result is contaminants that fall to the floor or specialized collection trays, which are then cleaned up by the homeowner. The advantage of Desktop air purifier with HEPA filter compared to negative ion generator is that it really captures air pollutants.

On the other hand, since the negative ion generator only allows particles to fall from the air to the ground, it is easy for them to re-enter the air due to walking. This creates an endless cycle of impurities from the ground to the air. While the product with the catcher plate works better, it's not perfect.

The difference in the maximum coverage area, because the Desktop air purifier with HEPA filter uses a physical filter, the maximum coverage area is not as wide as the negative ion generator. In fact, the maximum purification space of Desktop air purifier with HEPA filter on the market is 700 square meters. While that's enough for most homes, it's not enough for large office spaces. In contrast, some negative ion generators have a maximum purification space of 3,500 square meters.

On the other hand, Desktop air purifier with HEPA filter comes in all shapes and sizes. Matching products can be selected according to the room decoration style. Some products are wall mounted, which means they can be placed anywhere in the room. In addition, Desktop air purifier with HEPA filter has more options in color and style.