Measurement of impurity parameters in purified gas

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Our factory produces natural gas from coke oven gas; we have our own coking plant. The laboratory used to test for impurities with high concentrations only, such as benzene, naphthalene, tar, ammonia, and hydrogen sulfide after chemical processing. However, due to the high concentrations, chemical analysis was primarily used in the past, and the accuracy of such measurements was not very high. Now that we have this new equipment, the levels of impurities after purification are basically 1 mg/Nm3 or 1 ppm. Manual analysis certainly does not provide sufficient accuracy. We have also visited similar companies, and I have a few questions regarding chromatography. 1. What is the detection accuracy of chromatography for coke oven gas? Can it detect impurities at 1 ppm? Can it detect some at 0.1 ppm? 2. Can HCN and NH3 in coke oven gas be detected by chromatography? 3. I heard that determining benzene and naphthalene in coke oven gas is quite complicated, as the levels to be measured are as low as 1 mg/Nm3. Is there any simpler method?