2065 438+03 13 NPC and CPPCC are one of the "five hot topics" concerned by netizens. /kloc-in October, 30 provinces in China suffered from haze.

(1) Fog is a liquefaction phenomenon of water vapor in the air near the ground. There are two basic conditions for the formation of fog. One is that the air near the ground is rich in water vapor. The other is the low ground temperature.

② 1 μ m = 10-6m, then 2.5 μ m = 2.5× 10-6m.

(3) Frequent "smog" weather has seriously affected people's lives. PM2.5 is the main cause of "smog" weather, which is rich in a large number of toxic and harmful substances and is one of the indicators to measure air quality. PM 2.5 is also called particulate matter entering the lungs. Because of its small size, people can directly enter the lungs when inhaling. Its main source is the residue from combustion in daily power generation, industrial production and automobile exhaust emission.

(4) The increase of static wind means that the airflow is obviously weakened when passing through the urban area, mainly because the buildings in the city are built higher and higher.

(5) Haze has a great impact on people's physical and mental health, and self-protection is particularly important.

① Open the window less in foggy days. It is not recommended to open the window for ventilation in the morning and evening in foggy days. Better wait until the sun comes out.

② There is more fog and less sunshine in winter. Due to insufficient ultraviolet radiation, vitamin D produced in human body is insufficient, which will make people feel lazy and depressed.

So the answer is: (1) liquefaction; Low; (2)2.5× 10-6; (3) residue; (4) a; (5) Do not advocate; Ultraviolet rays.