SPN units can be either "SPN23 [#/km]", "SPN23 [#/kWh]" . This behavior also happens with PM Exhaust. Check `data-raw/ef_europe_emep_db.R`
SPN units can be either "SPN23 [#/km]", "SPN23 [#/kWh]" . This behavior also happens with PM Exhaust. Check
data-raw/ef_europe_emep_db.R