AIR pollution in Yorkshire and Humberside was at its highest level this morning and people were told to reduce physical exertion.

According to data by the UK Air Information Resource, pollution levels were "very high" (on a 10 out of 10 scale for air quality) in the Yorkshire and Humber at 10am this morning,  but the level at 11.30am dropped to "high" (eight out of 10).

Due to the poor air quality, the general population was advised to reduce physical exertion, particularly outdoors.

Pollution levels measured higher in coastal regions and London while at 11.30am Bradford levels were only moderate.

Accoring to advice on UK Air Information Resource, when levels are very high (nine or 10): "Adults and children with lung problems, adults with heart problems, and older people, should avoid strenuous physical activity.

"People with asthma may find they need to use their reliever inhaler more often.

"Reduce physical exertion, particularly outdoors, especially if you experience symptoms such as cough or sore throat."

When levels are high (seven or eight), "adults and children with lung problems, and adults with heart problems, should reduce strenuous physical exertion, particularly outdoors, and particularly if they experience symptoms.

"People with asthma may find they need to use their reliever inhaler more often. Older people should also reduce physical exertion.

"Anyone experiencing discomfort such as sore eyes, cough or sore throat should consider reducing activity, particularly outdoors."

When levels are moderate, "adults and children with lung problems, and adults with heart problems, who experience symptoms, should consider reducing strenuous physical activity, particularly outdoors.

"Enjoy your usual outdoor activities."

To read more about a Clean Air Zone for Bradford, click here.