Question: What color is the gas in the troposphere of the Leighton relationship equation?

<P0-S0> Ozone (systematically named 1λ,3λ-trioxidane and "catena"-trioxygen), or trioxygen, is an inorganic molecule with the chemical formula O3 . <P0-S1>  It is a pale blue gas with a distinctively pungent smell. <P0-S2>  It is an allotrope of oxygen that is much less stable than the diatomic allotrope O2 , breaking down in the lower atmosphere to O2 or dioxygen. <P0-S3>  Ozone is formed from dioxygen by the action of ultraviolet light and also atmospheric electrical discharges, and is present in very low concentrations throughout the Earth's atmosphere (stratosphere). <P0-S4>  Its concentration is highest in the ozone layer region of the atmosphere, which absorbs most of the Sun's ultraviolet (UV) radiation. <SEP> <P1-S0> In chemical kinetics, the entropy of activation of a reaction is one of the two parameters (along with the "enthalpy of activation") which are typically obtained from the temperature dependence of a reaction rate constant, when these data are analyzed using the Eyring equation. <P1-S1>  The standard entropy of activation is symbolized ΔS and equals the change in entropy when the reactants change from their initial state to the activated complex or transition state (Δ = change, S = entropy, ‡ = activation). <P1-S2>  It determines the preexponential factor A of the Arrhenius equation for temperature dependence of reaction rates. <P1-S3>  The relationship depends on the molecularity of the reaction: for reactions in solution and unimolecular gas reactions A = (ekT/h) exp(ΔS/R), while for bimolecular gas reactions A = (ekT/h) (R'T/p) exp(ΔS/R). <P1-S4>  In these equations e is the base of natural logarithms, h is the Planck constant, k is the Boltzmann constant and T the absolute temperature. <P1-S5>  R' is the ideal gas constant in units of (bar*L)/(mol*K). <P1-S6>  The factor is needed because of the pressure dependence of the reaction rate. <P1-S7>  R' = 8.3145 * 10^-2 (bar*L)/(mol*K). <SEP> <P2-S0> In atmospheric chemistry, the Leighton relationship is an equation that determines the concentration of tropospheric ozone in areas polluted by the presence of nitrogen oxides. <P2-S1>  Ozone in the troposphere is primarily produced through the photolysis of nitrogen dioxide at wavelengths (λ) less than 430 nm, which are able to reach the lowest levels of the atmosphere, through the following mechanism: <SEP> <P3-S0> The Freundlich equation or Freundlich adsorption isotherm, an adsorption isotherm, is an empirical relation between the concentration of a solute on the surface of an adsorbent to the concentration of the solute in the liquid with which it is in contact. <P3-S1>  In 1909, Herbert Freundlich gave an expression representing the isothermal variation of adsorption of a quantity of gas adsorbed by unit mass of solid adsorbent with pressure. <P3-S2>  This equation is known as Freundlich adsorption isotherm or Freundlich adsorption equation. <P3-S3>  As this relationship is entirely empirical, in the case where adsorption behavior can be properly fit by isotherms with a theoretical basis, it is usually appropriate to use such isotherms instead (see for example the Langmuir and BET adsorption theories).