V. Letting Dust Reach One's Throat
1612. Allowing thick dust to reach one's throat makes one's fast void, whether the dust is of something which is Halal to eat, like flour, or of something which is Haraam to consume, like dust or mud, and as per obligatory precaution, one should not allow thin dust also.
1613. If thick dust is whipped up by the wind and in spite of taking notice of it he does not avoids it, allowing the dust to reach his throat, his fast becomes void.