And she is always a troublemaker.

Tim is the black sheep of the Jones' family.

The member of the family who is always in trouble is the black sheep.

Troublemakers rarely become model citizens.

Tracing a renegade's family background, you'll find him the black sheep.

Just how well can masks block the, even smaller than pollen, yellow sand dust? I think it much more of a nuisance than pollen.