Construction a factory near a community brings job and prosperity to it, Also it causes some problems such as air pollution, noise, and some other disadvantages which I will explain in the following and because of outweighed risks I oppose the plan to build a factory near my city.
Look at Ahmad's comment;
(You wrote all the introduction through only one sentence. Each introduction has three parts, but in this case it has two parts : 1) Motivator 2) Thesis statement 3) Your opinion (if the topic is an "agree or disagree" one you should write your opinion at the end of the introduction).
Yes... this is exactly what you are supposed to do with your introduction if you are keen on earning good marks for this task. Let's try to arrange your intro as he suggests;
Construction of a factory near my community may benefit my people by creating new job opportunities. However, along with that it my also cause several adverse environmental issues such as noise and air pollution. When the advantages and disadvantages are compared, I believe that disadvantages of this project would certainly outweigh its benefits to my community.I have consumed three sentences to tell what you said in one sentence. But it is important that your sentences are clear. Therefore avoid very lengthy sentences and tell your ideas in simple short ones : )