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　　When you're looking for the best air purifier, the first thing to consider is the machine's Clean Air Delivery Rate (CADR), which gives you an idea of how effectively you can clean the air in your room. The CADR score is an extremely important parameter of the machine to indicate how much filtered air the purifier delivers into the room. Basically, each air purifier we reviewed had three separate CADR ratings: one for smoke, one for dust, and one for pollen. The higher the CADR score, the better the machine will remove air pollutants from your home. Note that not every air purifier on the market has a CADR score, making it difficult to compare with others.

　　CADR scores can also help you determine the size of the room in which the machine will be used. As a rule of thumb, you don't want to use an air purifier in a room larger than the recommended size because it becomes ineffective or even useless. Instead, you want to buy an air purifier with a recommended room size larger than the actual room size you'll be using.

　　To take this idea further, you also want to pay attention to the number of air changes per hour that the air purifier can perform. This specification tells you how many times per hour the machine can filter the air in the room, which is especially important if you suffer from allergies and want to relieve your symptoms. The more air changes a purifier can perform, the more air in the room passes through the system and removes contaminants.

　　Another factor to consider is the air purifier's airflow, or the rate at which air moves through the filter and cleaning system. While this specification isn't directly related to CADR scores (even though many manufacturers sell their products this way), airflow can help you determine if a machine is right for your situation. Airflow is measured in cubic feet per minute, and the more air moves through the unit, the better chance the machine has to remove contaminants. In general, the higher the airflow, the better.

　　When you're looking for the right air purifier, be sure to include a HEPA filter, which removes 99.97% of 0.3-micron particles. HEPA filters are the industry standard because they remove particles that other types of filters cannot match. Many purifiers also include a pre-filter, usually made of carbon, that traps larger particles so you don't have to replace the HEPA filter as often and helps eliminate odors. Some air purifiers include other filters to help remove particles such as pet dander and bacteria.

　　Therefore, in the face of domestic and foreign air quality, we must learn to protect ourselves. So choosing a suitable air purifier is crucial. Only the ideal choice can give full play to its value. To say goodbye to the source of pollution.

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