Do you mean measuring Nitrogen concentrations in the air??

Yes

There are gas "standards" for calibration, and there are equipments for measuraments of nitrogen oxides concentrations in air...

 I agree with the others, first it must be very clear the gas specie: molecular nitrogen? or a isotopomer of it? or other nitrogen compounds like N2O, or NOx? or do you want some of the nitrogen compounds? which ones? and where you want to collect the nitrogen in air? or is soil? if in air, you need a evacuated gas cylinder, use a GC-TCD with columns that separates permanent gases and  a GC gas inlet that take a few mbar (below the atmospheric pressure). Contrary to NOx, N2 and N2O are very stable with low humidity and oxygen in the sampling cylinder. In the National Metrology Institutes the N2 in measurement standards is normally a balance gas, so we do not measure it for calibration standards, like Certified Reference Materials (CRM), normally we measure in the N2 only the critical impurities for the application of the CRM. But you can measure N2 by GC-TCD!

thank you sir