The composition of haze weather is 600 words.

The weather today is really strange. It is still cloudy in the morning. At about 6 pm, a thin layer of fog gradually appeared on the horizon, covering the distant hills. I thought it was the night that covered the horizon. After five minutes, when I leaned over the window and looked into the distance again, I accidentally found some small granular water droplets on the window glass. After careful study, I found that every droplet contains a small black dust particle, which makes me curious. Looking further away, the tall building seems to be tied with soft white gauze, and the neon-dotted ribbons are more and more ethereal; Cars passing by the parking lot also turned on fog lights, and the light emitted was like a light beam, which was very attractive. It's getting dark, and the water drops on the window are gathering more and more. Slowly, more and more water droplets are sucked. Everything outside the window is so quiet and beautiful that I can't help being deeply attracted ... Just as I was intoxicated, a flash of lightning flashed across the sky, accompanied by lightning, and the rain poured down. The rain beat against the glass and the dust was washed away. The fog just now has been blown away. Hey, isn't this the smog phenomenon mentioned in the nature book? I dug up a thick book "100,000 Why" at home. Ha, finally found it-yes, this is smog! It is because a large number of particles, such as smoke and dust, are suspended in the air, which blurs the line of sight and reduces the visibility. No wonder there are particles on the window glass. It turns out that the dust in the air is at work!

Because the more serious air pollution is now, the more foggy weather there will be, and the greater the harm. Sometimes cars can't drive and planes can't land. In order to reduce smog weather, we must protect the environment, plant more trees and grass, improve air quality and benefit mankind.

When the temperature is lower than the dew point, the water vapor in the air near the ground condenses to form fog. If the fog rises off the ground, it becomes a cloud. It is a milky white suspension system composed of a large number of water droplets or ice crystal particles, and the relative humidity of the air is close to 100%. When the concentration of suspended particles is high near factories and other places, it will appear yellow-gray Fog will reduce the horizontal visibility of the air, which can be divided into light fog, fog, fog and dense fog. Light fog usually appears in the morning and evening, and the horizontal visibility is 1~ 10 km. Fog visibility is 0.5~ 1 km; The visibility of fog is100 ~ 500m; Visibility in dense fog is less than 100 meter. In Chinese dictionaries, haze is interpreted as cloud gas and light fog, while in meteorology, it refers to the phenomenon that tiny water droplets are suspended in gas. When fog appears, the horizontal visibility is generally higher than when fog appears, usually above 10 km. At present, there are a lot of suspended particles in the urban air, which provide a lot of condensation nuclei of water vapor, so there is also a lot of smog. It is reported that Shenzhen has 100 days a year. But haze is not a strict concept, so it is rarely used in meteorology. In history books, the word "haze" is used to indicate the weather with sandstorms, and there is a saying that "wind and rain are haze". Haze is a weather phenomenon in meteorology, which refers to the phenomenon that a large number of extremely fine dry dust particles float evenly in the air, making the air with horizontal visibility less than 10 km generally turbid. Mist makes bright objects in the distance slightly yellow and red, and dark objects slightly blue. When water vapor condensation intensifies and air humidity increases, haze will turn into fog. The formation of smog is closely related to the discharge of pollutants. In cities, motor vehicle exhaust and other smoke and dust emission sources emit micron-sized particles, which stay in the atmosphere. When adverse weather such as inversion and still wind appears, smog is formed.

A composition about fog

The battle of fog

The fog in the morning is warm, like a child who has just laughed. The fog at night is deep, like a sentry who focuses on his post. Sun and moon are friends; Snowflakes and ice are friends; The fog is the wind, and they are a pair of good friends made in heaven. But there is a war between the fog and some stars.

One morning, I saw the fog outside the window and there were few pedestrians in the street. In the foggy sky, I seem to see a little star calling its partners to play together. Soon one ... two ... three ... a dozen ... all of them blinked their naughty eyes hard. They don't seem to be playing, and the scene is a bit serious, as if discussing a major event that is related to the life and death of the star family. Stars from all walks of life compete to speak freely.

A star said, "Mobile, how long will the fog stay here?" I can hardly breathe. "Kid (the son of mobile phone) is eager to try:" Hum, if you don't compare with them, you can't beat them! """We are just a vulnerable group. If you insist on touching the stone with eggs, there is only one result-the whole army will be wiped out. "Said the phone helplessly. "Oh, how did that happen? We can beat one enemy by ten. " "Impossible, absolutely impossible," everyone said in unison, "but for the honor of our star family, we must fight to the end!" One voice, two voices, three voices ... everyone is dead, and the mobile phone decided to let all the stars fight for honor!

In the sky, the sound of swords and guns and fighting suddenly appeared ... dozens of voices gathered together, as if a spectacular symphony performance was staged in the theater.

Things spread to wind, snow, rain, electricity ... the gods and street lamp workers want to end this war together. Finally, the gods advised the fire to go home with a fog three feet high. It depends on the staff. They made a sign to the staff, and then quietly turned around. The staff safely put down a stone, listlessly walked back to the office and turned off the light. ...

The finale of the fog and electricity war. "Yico Zeng, get up, it's nine." I just realized that the fierce battle just now was just a dream of mine. In retrospect, this dream was so real and intense, it was really interesting and exciting! Hehe, after waking up, I stupidly asked my father what day it is today. Dad said to me in distress situation: "Today is Wednesday of summer vacation. I didn't wake you up because I wanted you to sleep a little longer." . I looked back at the fine weather outside the window. That's the clear sky in Wan Li! Fortunately, there is no war between fog and electric lights.