Where is the fog?

Where is the fog? The text reads as follows:

Where is the fog? When he went out in the morning, Xiao Ming found it foggy outside the window, as if he could not see anything clearly. He climbed to the windowsill and saw many pedestrians in the street. They are all in a hurry. Xiao Ming asked his mother curiously, "How did the fog come from?" Mother said, "The weather forecast says it will be foggy today." Xiao Ming asked again, "Why is there fog?" Mother told him: "Fog is formed by condensation of water vapor in the air."

Xiao Ming is very interested. He asked, "Where is the fog?" Mom smiled and said, "It's all around us, but we can't see it." Xiao Ming was surprised. He thought, "Why can't we see the fog?"

Mother explained, "Because the fog particles are very small, just like we can't see the air. However, you can try to fan with your hand, or breathe, and you can see the fog. "

Xiao Ming immediately reached out and gave it a fan. Sure enough, he saw some fog floating in the air. He told his mother excitedly, "I saw it, I saw it!" " "Mom smiled and said," isn't it amazing? "

Xiao Ming then asked, "Will fog affect people?" Mom said, "Yes, there is a lot of water in the fog, which is easy to catch a cold, and it will also lead to low visibility and inconvenient road traffic."

Xiao Ming thought for a moment and asked, "What should we do?" Mother said: "Wear more clothes and masks before going out, and pay attention to safety."

Xiao Ming listened to his mother's words and suddenly thought of a question: "Where did the fog in the city come from?" His mother told him: "the fog in the city usually comes from automobile exhaust, factory exhaust gas, coal burning and so on." , it will produce a lot of pollutants, which will cause harm to the environment and human health. "

Xiao Ming listened to it again and was very worried. He decided to make some contributions himself. From now on, he should do a good job of sorting at home every day to minimize the generation of garbage and protect our environment.

Seeing Xiaoming's enthusiasm, his mother smiled and said, "Good boy, this is not only good for the environment, but also good for your health."

Xiaoming was very happy after listening to his mother. He decided to start with small things and make his city more beautiful by helping protect the environment.

Xiao Ming's eyes gradually lit up and he was full of expectations for the future. He thought: As long as each of us does our part and keeps working hard, the world will definitely become better!