Each time a pollutant moves it has a chance to cause damage to health.

HEALTH REDUCTION CHANCE FROM POLLUTANT

Piece Type	Mint	Ill	Injured	Disabled	Dying	n/a
Animals and horses	n/a	n/a	n/a	n/a	n/a	1%
Children and gravidas	5%	10%	15%	20%	25%	n/a
Characters	1%	3%	6%	9%	12%	n/a