今年(2015年)除夕到正月十五期间，北京雾霾天气出现的天数占到50%以上，严重影响了老百姓的生活和健康。请写一篇短文，描述一下北京雾霾的情况，分析雾霾出现的原因，并提出治理雾霾的措施。 注意：词数不少于100词。
参考范文：
During the 15 days from New Year's Eve to Lantern Festival, Beijing was affected by smog for more than half the time, because of which people suffered a lot. On the road people drove slowly because they could not see clearly. People also suffered from many illnesses caused by smog.
The smog in Beijing has been caused by many factors, in which the increase of cars in the city area plays an important role. The cars send off a lot of poisonous gases, which in turn adds to the already serious air pollution.
In my opinion, the number of cars should be limited. We should call on the people to use more public transport. Only in this way can we expect to have more sunny days.