Not causing pollution or not being polluted.
Nonpolluting things are good for the environment and for people's health.
Examples:
The nonpolluting car runs on electricity.
Nonpolluting energy sources are important for the planet.
She likes to use nonpolluting products.
The nonpolluting factory helps keep the air clean.
The nonpolluting park is a safe place for animals.
I wish all cars were nonpolluting.