The former Big Breakfast presenter is the first person to be prosecuted by Kensington and Chelsea Council under the Fraud Act (2006) in relation to parking, the court heard.
Wearing a navy blue jacket, a blue chiffon blouse, blue cropped trousers and brown heels, Air said: "I'm a single working mummy.
"I don't have a nanny, I have a cleaner that comes to help a couple of times a week.
"Since I became single, I have a girl who comes in and helps with the mundane things, so I can focus on things with my daughter, such as sorting out bills and applying for parking permits.
"The details on the application form were filled in by the girl that was working for me at the time."
Air told the jury she was living in a flat she owned Holland Park but had been previously been renting a property in Pimlico.
"I decided to stay there (in Holland Park) full time because my property was empty.
"Sadly my tenants left in a hurry and didn't pay their rent for a couple of months so I decided to change my main residence.
"Prior to the tenants moving out I had been living at in Westminster."
But she returned to the Westminster address after just five weeks at the end of February last year, the jury heard.
Air admitted she often did not pay attention to terms and conditions and that she just presumed she could keep both permits because she had paid for them.
"I have never fully understood or been able to get my head round what it is I have done,' she said.
Speaking about the car crash, Air said: "I was with my daughter and was getting in my car and I was hit by a vehicle from behind.
"It was so horrible. I was left with multiple fractures to my leg."
Air admitted she was 'not as careful as she should have been' and later broke her other leg, leaving her in a wheelchair.
'I was not able to drive with two broken legs,' she said, adding that she only began to drive again last June.
Asked if she applied for the Kensington and Chelsea permit to avoid extra charges, she said: "I was not really parking anywhere because I had been hit by a car.
"To be honest I certainly didn't get out my calculator and work out an hourly rate of how much I was going to save over a year, I mean, who does that?"
Motorists without permits are forced to pay up to £6,000 annually to park in the Royal Borough, one of the richest in the capital.
Earlier council fraud investigator Nicholas Day told the court that Air had received six parking tickets in Kensington and Chelsea between April 4, 2011 and January 4 this year.
On June 7 last year both permits were displayed on the dashboard and windscreen, Mr Day said.
He said that a letter had been sent to Air insisting she return her Kensington and Chelsea permit on May 10 last year.
Mr Day said a refund was offered for the unexpired part of the permit but added: 'She still would have quite possibly been prosecuted because the offence had been committed, whether or not she returned the permit.'
But Air insisted she never received the letter and only became aware of the matter when she received a court summons.
Prosecutor Adrian Chaplin has told the court Air could not have been 'naïve' when completing the application form, having previously applied for one in Westminster.
The model, actress and television presenter denies a single count of fraud.
Air was acquitted by a jury after just 14 minutes.