The coronavirus pandemic has masked the economic dislocation caused by the referendum verdict, which backed severing five decades of integration with the European mainland.
Negotiated in marathon talks by EU and US officials, the truce will be formalised in Biden's summit with European leaders Charles Michel and Ursula von der Leyen.
"But there is a lack of reciprocity and there is a lack of fairness and that's why we tried last year to accelerate the negotiations in relationship with this investment agreement.
Under EU rules, member countries are required to keep the gas to under 40 micrograms per cubic metre -- but that level is often exceeded in many traffic-clogged European cities.
The trade source, who attended the meeting on Friday, confirmed the decision to set up the panel. The source declined to be named because of the sensitivity of the matter.
And last year, tech firms including Microsoft and Amazon suspended sales of facial recognition software to police forces when confronted with 2020's Black Lives Matter movement.