What is the ruling on dry urine with an odor and color that touches the foot? Does its impurity transfer to the carpet or tile after walking on it? Is the impurity removed by walking barefoot or wearing shoes? And what is the ruling on road dust and widespread donkey dung that cannot be avoided?

Worrying thoughts are numerous, and the effective treatment for them is to disregard them and pay no attention to them. Dry impurity does not transfer to what it touches if it is also dry. Merely the smell of impurity does not cause harm. Furthermore, the dust of street impurities and donkey droppings are excused due to the difficulty of avoiding them, and they do not render clothes impure.