Understanding APIS data

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

What emission sources are expected to be included in APIS "background" concentration and deposition values?

What monitoring data is used in the pollutant data on APIS?

How can I visualise APIS data for long features such as a river?

Why are there data missing about Areas/Sites of Special Scientific Interest in some of the critical level/load datasets for download?

How are the average three year concentration and deposition values derived for each UK grid square?

Where can I find data about critical loads, levels and background concentration and deposition for UK national (SSSIs) and international protected sites?

Can I get the data for all grid squares in the Search by Location Tool?

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