These statistical tools are designed to allow statistical analysis of the network database for up to four sites at a time.

The 'Air Quality Objectives' tool assesses compliance with the Government's AQ Objectives over any twelve month period as defined by the start date.

The 'Air Quality Indices' tool calculates the number of days recorded in each Air Quality Index band over any period.

The 'Sustainability Indicator' tool calculates the indicator values over any twelve month period. Please note that there are a number of requirements that a monitoring site must meet before a regional indicator can be compared to the national indicator. Visit the Sustainable Development web site for more information.

Alternatively, you can define statistics of your own. The 'My own choice' tool is very flexible, allowing you to enter your own dates, averaging periods and even exceedence criteria. Give it a try and if there are any other calculations that you would find useful, please let us know and we may be able to add them.

Make your selection from the buttons below and hit 'next':