Dealing with ammonia is an urgent health problem – yet levels are still rising

Government clean air strategy failing to control increasing emissions that add to 'hidden killer' of air pollution

• Revealed: UK government failing to tackle ammonia pollution
• Testing reveals hotspots at UK farms

Earlier this year, the government produced its first comprehensive clean air strategy, the result of years of campaigning, public outcry and finally a series of court actions ending in victory for activist lawyers over resistant ministers.

For the first time, that strategy promised action on the key role that ammonia plays in the cycle of air pollution - previous pronouncements on air pollution concentrated on transport and industrial emissions.