Everyone often hears the word PM in life, so what does PM mean?

1. In daily life, especially when discussing air quality, the word PM is often mentioned. This is a very common word in life, but many friends do not know what PM means. Next Let me tell you.

2. The most common meaning of PM is the abbreviation of particulate matter. The Chinese translation is particulate matter, which is small particles. Generally speaking, it is dust. It means various solid or liquid particles evenly dispersed in the aerosol system.

3. If the PM index is too low, it will cause serious air pollution, because the lower the PM index, the more particulate matter in the air, that is, the more dust. If the PM reaches 2.5, it will cause serious pollution.

4. In addition to the meaning of particulate matter, PM also has a very common meaning, which is the abbreviation of Latin post meridiem, which means afternoon, that is, afternoon. For example, PM2:30 means half past two in the afternoon.

The above is the explanation compiled by the editor for everyone, what does pm mean? If you don’t know it yet, come and find out quickly.