The first day of school in the China falls on 1 September, or the first Monday following if September 1 is a Friday, Saturday, or Sunday. In northeastern China, schools open on Monday in mid-August after summer vacation.
3) Improper heating profiles setting lead to unbalanced heating zones temperature inside heating furnace, which causes uneven glass temperature on both different parts of the glass sheet and between the top and bottom glass surfaces, thus may brings irregular white haze on glass surfaces.
Workers working in the open air have a high risk in their health. As a result, a vehicle such as cars and trucks what is burning fossil fuels is also the cause of haze. Vehicles have exhausted the black opium during the vehicle driving on the road which had compose the haze happened.