Vietnam ministry urges handling of straw burning
Farmers would need to sign a commitment form to pledge the discontinuance of straw burning
Thatch burning allegedly blankets city in central Vietnam with smog
A haze appeared around 10:00 am and lingered through 3:00 pm on Sunday
End to crop residue burning sought as stubble smoke affects flight visibility at Hanoi airport
Stubble burning has created thick plumes of smoke causing difficulty for pilots during landing