大雾天气对交通影响很大，飞机不能起飞和着陆，高速公路上行驶的汽车，河面、湖面和海面上航行的船舶等，都因雾天能见度差而引起交通事故

大雾天气对交通影响很大，飞机不能起飞和着陆，高速公路上行驶的汽车，河面、湖面和海面上航行的船舶等，都因雾天能见度差而引起交通事故增多。另外，雾也会给农业生产带来危害。连续数天大雾将使农作物因缺乏光照而影响生长，诱使病害发生。
专家提醒说，雾对人体健康的危害有很大的隐蔽性。据测定，雾滴中各种酸、碱、盐、胺、酚、尘埃、病原微生物等有害物质的比例，比通常的大气水滴高出几十倍。人们如果在雾中锻炼或散步，随着活动量的增加，呼吸加深、加快，就会更多地吸入雾中的有害物质，极易诱发或加重气管炎、咽喉炎、结膜炎等诸多病症。
【正确答案】：Fog has a great impact on transportation. Due to the poor visibility, airplanes cannot take off or land, and cars on expressways and ships on rivers, lakes and seas may have more accidents. Further, fog can do harm to farm production. Continuous foggy weather may retard the growth of crops for lack of sunshine and may lead to plant diseases.
Experts caution that the harmful effect of fog on our health is often concealed. It is determined through tests that the harmful substances in a fog droplet, such as acid, sodium, salt, amine, phenol, dusts and pathogen microbes, are dozens of times more than that in a normal atmospheric water drop. If we do physical exercises or go for a walk in foggy weather, we’ll breathe in more harmful substances with the amount of exercise increased and our breath deepened and quickened. This may lead to such diseases as tracheitis, pharyngolaryngitis and conjunctivitis, or make them worse.