In May 2015 the sudden death of more than 200,000 saiga antelopes in Kazakhstan baffled the world.

This week marks the 30th anniversary of the signing of the Montreal Protocol on Substances that Deplete the Ozone Layer. The signing of the Montreal Protocol was a landmark political event. The treaty is the first in the history of the United Nations to achieve universal ratification. Environmental science made it happen.

Could your garden be a vital frontline in the battle to protect and promote biodiversity? Barry Hague spoke to Professors Rosie Hails and Nigel Dunnett to find out more.

Research being conducted at a Beijing super-site is monitoring concentrations and varieties of airborne particles and volatile gases in the atmosphere and their potential impact on human health.

We could be encouraging antimicrobial resistance by overusing antibiotics but other factors may also be at play. We spoke to researchers going beyond the clinic to understand how drug-resistance builds up in the bacteria in our sewers and rivers.

Professor Kelly holds the chair in environmental health at King's College London, where he is director of the Analytical & Environmental Sciences Division. Here, he answers some key questions about air pollution in the UK's capital.

London's atmosphere may still have its mysteries, but compared to many places it's an open book.

Controlling our own emissions is a good idea, but plenty of the pollution problems most nations face come from abroad.