Fumes from school chemicals on school lawn  believed to have drifted into classrooms.

Students described symptoms including: blurry  vision, mucus coming down their throat and feeling light-headed.

Read more: http://www.dailymail.co.uk/news/article-2048232/50-Ohio-students-poisoned-weed-killer-Edgewood-Middle-School.html#ixzz1bDjtD51M