During Antarctic winter, $\mathrm{HNO}{}_3$ is taken up in polar stratospheric cloud particles and removed from the gas phase. The effect on ozone loss in spring is that

1. Amore $\mathrm{NO}{}_2$ is available, so ClO is sequestered and ozone loss is smaller
2. Bozone loss is unaffected because $\mathrm{HNO}{}_3$ is not related to chlorine chemistry
3. Cless $\mathrm{NO}{}_2$ remains to convert $\mathrm{ClO}$ into $\mathrm{ClONO}{}_2$, so active chlorine persists and ozone loss is larger
4. D$\mathrm{HNO}{}_3$ photolysis in spring directly produces ozone