Where can I check the daily air humidity?

The daily air humidity can be found on the website of the Meteorological Bureau or downloaded from the air humidity APP. Air humidity means that at a certain temperature, the less water vapor in a certain volume of air, the drier the air is; The more water vapor, the wetter the air. Web page link

Air, the "breath of life" we breathe every day, covers the surface of the earth layer by layer, is transparent, colorless and tasteless, and is mainly composed of nitrogen and oxygen, which has an important impact on human survival and production.

Air refers to the mixed gas in the earth's atmosphere, so air is a mixture, mainly composed of nitrogen, oxygen, rare gases (helium, neon, argon, krypton, xenon, radon), carbon dioxide and other substances (such as water vapor and impurities).

Among them, the volume fraction of nitrogen is about 78%, the volume fraction of oxygen is about 2 1%, the volume fraction of rare gases (helium, neon, argon, krypton, xenon and radon) is about 0.934%, the volume fraction of carbon dioxide is about 0.04% (data 20 17), and other substances (such as )

Oxygen in the air is necessary for all aerobic organisms. All animals need to breathe oxygen, so do green plants. In addition, green plants use carbon dioxide in the air for photosynthesis, and air is almost the only source of carbon dioxide needed by all plants.