Clothing company Levi Strauss is developing a list of ‘preferred substances’ – those safer for the environment and human health – for its suppliers.

The list will be a result of the company’s Screened Chemistry Programme, which assesses the environmental and human health impact of chemicals used in the finishing process of its products.

The programme uses chemical screening tool GreenScreen, and the US EPA’s Safer Choices Programme, to determine which substances are better to use.

Levi’s also joins ZDHC and Greenpeace’s Detox campaign to eliminate all release of hazardous chemicals, throughout its supply chain.