Residents are calling for action to be taken on a foul smell which hangs over parts of Wisbech.
People living in South Brink have complained about the stink and “thick air” which blights the area from the nearby factories.
Jacqui Weller and Francesca Meccaritllo say the problem has been going on for years and has become worse during the hot days.
They rely on air fresheners to counteract the smell in their bungalow, which can also be left with a film on the windows.
Mrs Weller would like to know more about what is causing the smell.
She said: “The smell is obnoxious and when we have hot days with high humidity levels there is no movement of air.
“When the air is greasy and thick, it leaves a film on the car and windows.
“The air can feel really thick. On really hot days, and despite having all the windows open and the fans being on, the thick air remains.
“I am in my 60s with respiratory problems and it can become uncomfortable. There are a lot of older people on this estate.
“We do have a lot of air fresheners in the house to try to keep it smelling as fresh as possible.
“I would like to know what the smell is.
“We are supposed to have a reasonable air quality and I want to know what is happening.”
Mrs Weller has started to keep a diary recording the smell after receiving advice from a councillor.
She began the diary six weeks ago.
Mrs Weller said: “The problem seems to have got worse over the last four to five years ago.”
Fenland District Council’s environmental health team have not received a complaint about the smell.
A spokesman has issued advice to residents on how to report smells which are affecting them. He said: “Anyone who is concerned about smells relating to commercial or domestic premises, or who wants to make a complaint, should ring the council’s environmental health team on 01354 654321 or email environmental email@example.com
“They should give details of the premises in question, how the smell is affecting them and their contact details.”