New research has identified severe ammonia pollution hotspots clustered around Lincolnshire, Herefordshire, and Norfolk — areas with the highest concentrations of intensive pig and poultry farms in Britain. The findings, published by Compassion in World Farming and Sustain, show that agriculture accounts for 89% of the UK's ammonia emissions, with industrial livestock operations releasing the gas from animal manure at levels that exceed what the environment and human health can safely absorb. Ammonia reacts with other pollutants to form fine particulate matter (PM2.5), one of the most dangerous forms of air pollution and linked to heart disease, stroke, and respiratory conditions; the development is particularly concerning as the UK government is simultaneously seeking to relax planning rules to facilitate the construction of more intensive livestock facilities.