What do the CLMaxN and CLMinN mean in acidity critical loads?

The acidity critical loads have a nitrogen component and sulphur component. APIS has provided a tool to help determine where there is exceedance of acidity critical loads.

This is available on the APIS website under Quick Links>> Critical Load Function Tool or the following URL will take you directly there. The critical load explanation pages are available at in the Guide to Critical Levels and Loads in the Quick links.