[x] add a filter that removes data for which the pblh is below a threshold (e.g. below 200m);
[x] change the name of the ‘pblh’ filter (e.g. to pblh_inlet_diff) to clarify it and change the filter so that only data taken more than 50m below the pblh is retained;
[ ] be able to apply different filters depending on the site.