The government has talked down claims its plan for the A14 would lead to breaches of air pollution limits.
The Campaign for Better Transport said the proposals, which include creating a toll road between Huntingdon and Cambridge, would "seriously worsen" air quality for people living nearby.
But a Department for Transport spokesman said: "The proposed changes to the A14 will move long-distance traffic away from Huntingdon and help to improve air quality there, not make it worse.
"The government understands the impact a national road project like the A14 can have on air quality, and that is why a full environmental assessment will be completed before any work happens."
More top news
Ipswich Town manager Mick McCarthy says that he has been impressed with trialists Giles Coke and Larsen Touré.
A woman has been telling ITV News Anglia how her dog saved her from crowbar wielding robbers who attacked her in her own home.
A Suffolk shepherd and his sheepdogs are starring in ITV's latest reality show, Flockstars'.