The method of differential optical absorption spectroscopy is an effective tool for open-path measurements ofatmospheric gases and impurities. The gas analyzers based on this method traditionally include a high pressure xenonlamp as the radiation source, that require high voltage, which makes gas analyzers are bulky and power-inefficient.Recent developments in fiber-coupling telescope technology and the availability of ultraviolet light emitting diodes havenow allowed us to construct a portable, long path gas analyzer. The gas analyzer comprises two UV-LEDs emitting inthe near UV-region of the spectrum, the system of optical fibers, a receiving-transmitting telescope, and spectrometerand treatment system. There are presents a description of the methodology and results of the measurement of chlorineand bromine oxides with gas analyzer based on UV-LEDs.
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