The nation's new chemical safety law promises to give the U.S. Environmental Protection Agency (EPA) expanded authority to regulate hazardous chemicals in consumer products. But of the tens of thousands of chemicals on the market, most never tested for safety, which should the EPA tackle first?

Today, the Environmental Working Group (EWG) released a list of high priority chemicals the EPA should act on quickly. It includes chemicals in products Americans use every day—detergents and household cleaners, clothes, mattresses, furniture, toys and even kids' jewelry.

The Environmental Working Group released a list of high priority chemicals the EPA should act on quickly.

"After decades of stagnation, EPA can now ban or restrict the use of toxic chemicals and order companies to conduct safety testing when more information is needed," EWG senior scientist David Andrews said. "It's important that the agency act promptly to eliminate or reduce Americans' exposure to industrial compounds linked to cancer, birth defects, hormone disruption and other health problems."

For many chemicals on the list, action is long overdue. For example, many Americans believe asbestos—a carcinogen that claims 12,000 to 15,000 lives each year—was banned decades ago, as it has been in 55 other nations. But U.S. industry still imports, uses and sells asbestos and asbestos products, including automobile brake pads and clutches, vinyl tile and roofing materials.

With so many hazardous chemicals in use, any list of those posing the greatest risks would be subjective and incomplete. But the vast catalogue of chemicals that have never been evaluated for safety make it urgent for the EPA to move quickly to tackle the backlog. The agency put 90 chemicals known to pose health risks on a list called the TSCA [Toxic Substances Control Act] Work Plan.

"The work plan list represents opportunities for assessment and regulation where EPA action is overdue," EWG senior scientist Johanna Congleton said. "In some cases, such as with some kinds of flame retardants, the initial EPA review was hindered by the lack of safety and exposure data. EPA must now use its expanded authority to fill in these critical information gaps."

EWG scientists scrutinized the chemicals on the work plan, analyzed studies by U.S. and international researchers and consulted fellow experts in environmental health. They considered each chemical's health risks, how widely Americans are exposed to it and the likelihood of EPA action under the new law.

Here are the 10 chemicals EWG urges the EPA to thoroughly review and regulate as soon as possible:

1. Asbestos

The cancer-causing substance is still found in automobile brake pads and clutches, vinyl tiles and roofing materials. While some uses have been banned since 1989, no new risk assessment is scheduled.

2. PERC

This probably carcinogen appears in dry-cleaning fluid, spot removers and water repellents.

3. Phthalates

These chemicals are linked to early puberty in girls and other reproductive harm. They show up in PVC plastic, toys and plastic wrap.

4. BPA

This carcinogen is also linked to infertility, developmental harm and diabetes. BPA is used in food cans and other food containers and cash register receipts.

5. Chlorinated phosphate fire retardants

These chemicals turn up in upholstered furniture, foam cushions, baby car seats and insulation. They are linked to possible nerve and brain damage.

6. TBBPA and related chemicals

This potential carcinogen and endocrine disruptor is seen in electronics, auto parts and appliances.

7. Brominated phthalate fire retardants

These chemicals are linked to developmental toxicity and appear in polyurethane foam for furniture and baby products.

8. 1-Bromopropane

This probable carcinogen is used in aerosol cleaners and adhesives and linked to reproductive harm.

9. DEHA

This probable carcinogen is found in plastic wrap and PVC plastic. It is also linked to developmental toxicity.

10. P-dichlorobenzene

This probable carcinogen is detected in moth balls and deodorant blocks. It is linked to liver and nerve damage.

EWG, from EPA's 2014 TSCA Work Plan