Pollution from road traffic, particularly diesel fumes, is the most significant cause of poor air quality in most cities.
Andy Atkins, executive director of Friends of the Earth, said the road would cause more pollution, damage the environment and do little to boost the economy.
In London, meanwhile, where road congestion and air pollution provide a decent argument for using government cash to subsidise rail journeys, there are now serious capacity constraints.
Stephen Hardwick, from the British Airport Authority, which runs Heathrow, Gatwick and Stanstead said efforts were already being made to limit the impact of noise and air pollution and road congestion around the airports.
Fewer car journeys means less pollution, fewer road accidents and shorter traffic jams, all of which would be welcomed my many.
Part of the reason for this decline is that many toads become homeless each year as wild ponds are lost due to road building, development, pollution, intensive farming and drought.
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Here the low price of petrol, much less than half of that in other developed countries, has predictably resulted in ever-larger and heavier vehicles that consume more fuel and road, and generate more pollution, than is necessary.
If you don't ease road congestion there will be more pollution damaging the environment.
Cheap fuel and mass-produced cars led to a shortage of road space and the need for pollution controls.
Objectors have also said they are worried about safety, pollution and the impact the road will have on nearby homes.
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Fewer vehicles on the road means less traffic congestion and less pollution.
The majority of the pollution is caused by vehicles on the road and experts say reducing traffic in the cities is the best way of improving air quality.
The number of vehicles entering the City's square mile has been cut by 25%, pollution is down by 15%, road accidents have been reduced by more than a third, and car crime has been halved.
The city council is extending its existing three air pollution problem zones: central, St Johns Road and Great Junction Street and adding two new ones at Inverleith Row and Glasgow Road.
Simply getting the tens of thousands of U.S. Postal Service vehicles that bring us our mail on Saturday off the road would be a good start for those concerned about carbon pollution.
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Third, the industry needs to continue to make good faith efforts to reduce adverse impacts across the board, in terms of water pollution, health and safety, noise, erosion, road damage and so on.
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The fleet of three lorries is patrolling 19 miles (30km) of roads with some of the worst pollution, including Victoria Embankment, Earl's Court Road, roads leading to the Blackwall Tunnel and in the Euston area.
He said they were unable to sit outside their homes due to traffic pollution and their lives had been transformed as use of the road had increased.
Under the Clean Air Act, Atlanta was told last year that it would get no more federal road money until it came up with a transport plan that cut air pollution.
For once, we believed that we would have what Hastings needed - and still needs - so badly, an infrastructure that would enhance people's lives and livelihoods, reduce environmental pollution and improve the health of those thousands of people who live on the A259 trunk road.
Maxis had gone down the multiplayer road to make the simulation more realistic by letting cities in the same virtual landscapes share elements such as pollution, crime and resources such as coal, she said.
Chinese officials last month implemented a drastic plan to combat Beijing's persistent pollution problems, taking half of the city's more than 3 million vehicles off the road, temporarily closing factories and chemical plants, and suspending all construction work.
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