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The concentration of krypton is 0.009 ppmv in the atmosphere, not 1 ppm as stated in the article. reference: https://www.researchgate.net/publication/244730914_The_Concentration_of_Krypton_in_the_Atmosphere-Its_Revision_after_Half_a_Century-

The "short" wavelength of KrF lasers is 248nm

The biggest uses of krypton by volume are: Used inside of halogen light bulbs Used in between panes of glass to increase the insulation factor of high efficiency windows ion beam etch of semiconductors