What height the instrument should be placed for measurement of ambient air quality and different gases as well as fetch area in agriculture?

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Is Journal of Agricultural Research a predator?

it is published by Juniper

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Ingo Riess

As always, it depends on what you are looking for. There is a European air quality directive 2008/50/EC, which describes measurement locations for various pollutants (Annex III). Maybe this will help you on your way:

https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32008L0050&from=en