Global climate change demands better use of energy and stricter limitations on the emission of greenhouse gases. Additionally, due to technological advances, automation in process analytics demand better in-situ sensor technologies. For this Raman spectroscopy is suitable, but the technique itself needs to be enhanced to be viable. Here, we present a first analysis for the suitability of fibre-enhanced Raman spectroscopy (FERS). We studied environmental gases by means of Raman spectroscopy with hollow core photonic crystal fibres (HC-PCF).