Pollution warnings for the Vale have been scaled down to ‘low’ by Defra.
Earlier in the week Aylesbury town was given an index of nine, the highest level on the government body’s scale is 10.
Even yesterday Waddesdon and Whitchurch were given a rating of eight, while Wendover and Princes Risborough were seven, which is still classed as high.
Along with other areas of the country, the Vale experienced high levels of pollution caused by storms in the Sahara Desert.
On its website a statement from Defra read: “Generally if you are young and in a good state of health, moderate air pollution levels are unlikely to have any serious short term effects.
“However, elevated levels and/or long term exposure to air pollution can lead to more serious symptoms and conditions affecting human health.
“This mainly affects the respiratory and inflammatory systems, but can also lead to more serious conditions such as heart disease and cancer.
“People with lung or heart conditions may be more susceptible to the effects of air pollution.”
In areas where air pollution is high residents with heart and lung problems and older people have been advised to avoid strenuous physical exertion.
People with asthma or other respiratory conditions have been advised to keep an inhaler close by.