POLLUTING

To make something harmful, especially by the addition of some unwanted product.

"The factory polluted the river when it cleaned its tanks."

To make something or somewhere less suitable for some activity, especially by the introduction of some unnatural factor.

"The lights from the stadium polluted the night sky, and we couldn't see the stars."

To corrupt or profane

Adapted or tending to pollute; causing defilement or pollution.