An user Dutch
says…

Hoeveel
Numeral
  onderzoek
Noun
  er
Adverb
  wordt
Auxiliary
  gedaan
Verb
  naar
Adposition
  de
Determiner
  luchtkwaliteit
Noun
  is
Auxiliary
  onbekend
Adjective
.

How much research is being done on air quality is unknown.

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