雾霾天气成为困扰很多城市的环境问题，引起了人们的广泛关注。请你就此写一篇小短文：
（1）分析雾霾天气形成的原因（至少两点）；
（2）提出解决的办法；
（3）号召大家关注城市环境问题。
注意：（1）字数 100 字左右；
（2）可适当增加细节，以使行文连贯。提示词汇： 雾霾天气 haze weather

【考点】提纲作文．

【答案】In recent years, haze weather has become an environmental issue worrying so many cities, which triggers widespread concern about air quality.
There are mainly two contributory factors behind haze. First, quantities of harmful fumes are discharged from factories, spreading in the sky and blocking the sunlight. Second, since the number of cars in the city has enormously increased, exhaust emission is gradually becoming another main factor contributing to haze.
Faced with such a serious situation, we must take effective measures accordingly. For instance, new laws and regulations must be passed to impose strict controls on industrial pollution. Besides, to set some limits on drivers going out too frequently or tax them if they travel a long time, say, more than five days a week.
To improve our living conditions, let's join hands to attach great importance to the environmental problems of our city.