Which transition will produce the spectrum line with the lowest wavelength in this atomic spectrum

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.