Limitations of Henry's law
(Source: chem.libretexts.org)
In the image, we see that for a &quot;real gas&quot; (indicated by non-ideal solution), Henry's law is applicable for $\ce{\chi} &lt;&lt; 1$.
As, $$\ce{p = K_H \cdot \chi}$$ hence the pressure should be low.
Limitations of Henry's law:

The pressure should be low and the temperature should be high i.e the gas should behave like an ideal gas.

The gas should not undergo compound formation with the solvent or association or dissociation in the solvent.