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Past emission controls in the UK have substantially reduced precursor emissions of health‐hazardous fine particles (PM_2.5) and nitrogen pollution detrimental to ecosystems. Still, 79% of the UK exceeds the World Health Organization (WHO) guideline for annual mean PM_2.5 of 5 μg m⁻³ and there is no enforcement of controls on agricultural sources of ammonia (NH₃). NH₃ is a phytotoxin and an increasingly large contributor to PM_2.5 and nitrogen deposited to sensitive habitats. Here we use emissions projections, the GEOS‐Chem model, high‐resolution data sets, and contemporary exposure‐risk relationships to assess potential human and ecosystem health co‐benefits in 2030 relative to the present day of adopting legislated or best available emission control measures. We estimate that present‐day annual adult premature mortality attributable to exposure to PM_2.5 is 48,625 (95% confidence interval: 45,188 …