There is a rule that when the economic is keep growing fast, especially in the developing contry, the evironment would be neglect. And when the people realize the import of environment, it’s too late. Among all the pollution, air pollution and water pollution would directly do harm to human body. Then we need air purifier and water purifiers to take care our health, to give us a healthy life.
The air purifier market is vast and riddled with confusing and often misleading advertising schemes. If you’re shopping for an air purifier, then you should first consider what kind of pollutants you’re trying to eliminate. For example, if you have problems with cigarette smoke, then you’ll want to make sure your air purifier has the ability to eliminate fumes, TVOC, and other gases.
You may also want to consider the following factors before buying an air purifier: the area coverage (make sure the square footage listed for the air purifier is about the same or slightly greater than the square footage of the room where you intend to use it); the ACH rating (Air Changes Per Hour-this number lets you know how frequently the air purifier can exchange all the air in a given room); the CADR (the Clean Air Delivery Rate tells you how much air is purified and how well it is purified); and also the price; how often you have to replace the filters and how much they cost; the noise level of the air purifier; energy usage; whether it emits ozone; extra features (like a filter change indicator light); the manufacturer’s reputation; and the warranty. And some optional functions, such as humidifier, WIFI, Bluetooth.