The US is investing $1.9 million (£1.2m) to help small businesses develop and commercialise technologies that tackle critical environmental problems.
A total of 19 will receive a share of the loan from the Environmental Protection Agency (EPA).
The technologies are focused on air and climate, toxic chemicals, water, building materials and homeland security research.
Some of the companies receiving a share of up to $100,000 (£64,000) to design their projects are Faraday Technologies, MicroChemica and SioTeX Corporation.
Once they are commercially viable, firms will receive a second loan of up to $300,000 (£192,000) to develop and introduce their technologies into the market.
Thomas A. Burke, EPA Science Advisor and Deputy Assistant Administrator said: “Small businesses today are revolutionising the tools available to protect human health and the environment. Their technologies are creating new innovative solutions while ensuring a commitment to environmental sustainability.”