The map shows which areas are expected to be above the objective level (50µg/m³ not to be exceeded more than 35 times per year in 2010).
The borough is likely to exceed the objective level only 8 to 9 days a year. The major roads are predicted to exceed the objective level over 35 times a year. The daily objective is likely to be exceeded along the main arterial roads such as the Westway and the Cromwell Road and more sporadically along other busy routes.

Modelled daily mean PM10 exceedences (days) for 2010 using 2010 emissions and 2003 meteorological data.