An asphalt plant in Hayes must be shut down unless its operators reduce pollution levels, an MP has demanded.
He added: “I am extremely fearful for the health and safety of local residents and local employees working in the surrounding area.
“That is why I am calling for firm action from the council to either force the company to tackle the emissions problem or, failing that, to shut the operation down until it is safe to reopen.”
Mr McDonnell said he had heard that tenants in a housing block in Southall had been complaining for months of smells thought to be coming from the plant, which produces up to 300,000 tonnes of asphalt per year.
He said he had been told that filters in the housing block's air ducts were being covered in a sticky residue smelling like bitumen, which he said he understood had also been found on tenants' cars.
Speaking of the problem generally, he added: “People are saying that the acrid smells are so bad that it makes them feel headachy and nauseous. This has been going on now for nearly 10 months since the plant opened.
“I have been raising this issue with Hillingdon Council over the months since then and demanding action and yet the problem continues. It has now gone beyond any reasonable time limit.”
The council's environmental health team, which is investigating the situation together with Public Health England, has the power to serve enforcement notices on companies and individuals, requiring them to reduce emissions.
In situations where there is evidence that emissions are posing a risk of serious pollution, the council can serve suspension notices requiring the immediate end of any activity that produces dust or odour.
Jean Palmer, the council's deputy chief executive and corporate director of residents' services, said: "The most effective way of improving the situation for residents and local businesses is to continue working with FM Conway Ltd and holding them to account.
"We have already secured the installation of new equipment at their plant to reduce odours and the building has recently been sealed to prevent odours from escaping.
"Another system to further reduce odour levels will be added to the plant this week, and some further process improvements are scheduled for early June.
"However, if we are not satisfied that this approach is working and resolving the odour problems, we will take appropriate action."
An FM Conway spokesman said the plant had never failed to meet the required legal standards and that its emissions were continually monitored.
He added: “The manufacture of asphalt involves the use of hot bitumen and can produce an odour which some may find unpleasant.
“This is common to all asphalt plants and it should be noted that there are four such plants within the immediate area of Hayes.
“Some of our close neighbours have contacted us with concerns regarding odour and we are working collaboratively with them to ensure that we mitigate any such nuisance to their satisfaction.”