Assessed continental-scale trends of Cl⁻, Br⁻, and Cl⁻/Br⁻ ratios of wet deposition.

Censored Br⁻ concentrations were imputed using a robust compositional data technique.

Cl⁻, Br⁻ and Cl⁻/Br⁻ ratios of wet deposition decrease with distance from coasts.

A regression is presented relating Cl⁻/Br⁻ ratios to inland distance.

Niagara Falls and Great Salt Lake appear to affect compositions at proximal sites.