High-power pulsed laser diodes are employed for determining atmospheric humidity and methane. The proposed DIAL method optimises the spectral properties of laser radiation within the molecular absorption bands of 0.86-O.9prn of these major greenhouse gases. The explicit absorption spectrum is explored by computational convolution method based on reference data on spectral linestrengths modulated by the characteristic broad laser line of the selected laser diodes. The lidar scheme is ultimately compact, of low-energy consumption and suggests a large potential for ecological monitoring.The distribution of atmospheric water vapour is very important for understanding the greenhouse effect and weather phenomena. Water cycle that maintains the process of atmospheric circulation is highly dynamic and is the main energy
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