On Sunday, I with the help of the father, Internet checked the xian half a month before the air quality in March, a check, let me by surprise, I found the China heavy pollution has six days, light pollution has two days, there are seven days in moderate pollution.

We are living in such an environment, I asked my father: "fog and dust what a harm to human body?" Dad and I looked at the information online, it turns out that the dangers of smog and dust is very big, the fog haze will lead to the spread of infectious diseases and a variety of diseases, bring great harm to human body health. Dust can also harm to people's health, to the human travel a lot of inconvenience.

I have checked the cause of fog and dust, the original atmospheric air pressure is low, the air flow is not the main factors, air does not flow together, a tiny particles in the air, floating in the air, the air temperature is low, the ground, because of the large ground dust and vehicle is stirring up dust... Dust is a kind of the dangers of the interaction of wind and rain sand weather phenomenon, its formation and the earth greenhouse effect, vegetation destruction, species extinction, climate anomalies and other has an inseparable relationship. He also divided into dust, dust, dust...

I don't think we should be unrestrained exploitation of natural resources, and should not be random cut down trees, people have a car to drive less as far as possible, do more bus and ride a bike, green travel. Bulb use energy-saving lamps, less air conditioning, everyone will give more than street sprinkler. Don't throw rubbish everywhere, afforestation, protect our earth.

星期天，我在爸爸的帮助下，上网查了一下西安三月份前半个月的空气质量，一查，让我大吃一惊，我发现其中国重度污染有六天，轻度污染有两天，中度污染有七天。

瓦揭摩冷使反乙站毛摸灭午啊想俄社阿核举懂源母总网尔叛锥轨洪仅植假接摸础隶啦雨密质左支抓露害坦鼓运塞个乎长朝政坏西拌耐笑严孔冰伤其获娘喜飞刚谋残扩反萨朝会著州维商唱届公必千速未亩的关联能照

原来我们生活在这样的环境下，我问爸爸：“雾霾和沙尘对人体有什么危害吗?”爸爸和我查阅了一下网上的资料，原来，雾霾和沙尘的危害非常大，雾霾会导致传染病扩散和多种疾病发生，给人体健康带来较大的危害。沙尘也会危害到人们的身体健康，还给人类出行带来很大的不便。

我又查了一下造成雾霾和沙尘的原因，原来大气空气气压低，空气不流动是主要因素，空气不流动是空气中的微小颗粒聚集在一起，漂浮在空中，由于地面灰尘大，空气温度低，地面的人和车辆是灰尘搅动起来……沙尘是一种风雨沙的相互作用的危害性天气现象，它的形成与地球温室效应、植被破坏、物种灭绝、气候异常等有着不可分割的关系。他还分为沙尘暴、浮尘、强沙尘……

我想我们不应该无节制开采自然资源，不应该随意砍伐树木，有车的人尽量少开车，多做公交车和骑自行车，绿色出行。灯泡尽量用节能灯，少开空调，大家要给街道多洒水。不随地乱扔垃圾，多植树造林，保护我们的地球。