Humans have massively altered nitrogen flows on our planet, leading to both benefits for food production as well as creating multiple threats to the environment. There are few places on Earth more affected than South Asia, with levels of nitrogen pollution rapidly increasing. Nitrogen pollution damages human health, threatens biodiversity, and contributes to global climate change. The UKRI GCRF South Asian Nitrogen (SANH) aims to tackle the nitrogen challenge by bringing together experts from over 32 leading research organisations from across South Asia and the UK. We work with researchers from all eight South Asian countries and are dedicated to international co-operation for a healthier planet. The Hub includes research on how to improve nitrogen management in agriculture and investigates how nitrogen is impacting our ecosystem. SANH is also working with South Asian governments to further develop the policy conversation on nitrogen management in the region. Together we can overcome the nitrogen challenge for a healthier planet!