Adds pollen variables needed by gunnar

[dulte]

Change Summary

Adds some variables and emep variables need by Gunnar for pollen evaluation.

Related issue number

No related issue

Checklist

• [x] Start with a draft-PR
• [x] The PR title is a good summary of the changes
• [x] PR is set to AeroTools and a tentative milestone
• [ ] Documentation reflects the changes where applicable
• [ ] Tests for the changes exist where applicable
• [ ] Tests pass locally
• [ ] Tests pass on CI
• [ ] At least 1 reviewer is selected
• [ ] Make PR ready to review

[dulte]

Needs to update some test with the new variables. Will fix next week