How can I get critical loads for Local wildlife sites?

APIS has information available about designated sites that are explicitly covered by the country nature conservation bodies (eg European Sites and Areas/Sites of Special Scientific Interest). Currently APIS does not include local wildlife sites as this information is held by the local authority or site manager.

However, you can use the habitats table showing critical loads to use in risk assessment.

Alternatively, you might consider using the habitat and critical load/level data available at the link .  Professional judgment can be used to approximate the local wildlife site habitat with habitats in this dataset to determine the critical levels and loads to use in assessment.