Environment, Climate Change, One Health and Migration

We work to prevent disease and promote health by addressing key areas of environmental health including climate change, clean energy; air quality; water, sanitation and hygiene (WASH); and chemicals and radiation. Health threats are addressed through a One Health approach....

Technical areas of work

Air Quality, Energy and Health

Chemical Safety and Health

Climate Change and Health

Cross-cutting

Health and migration

One Health Initiative

Radiation and health

Water Sanitation and Health (WASH)

Emergencies

Interventions

Monitoring

Settings & populations

Training

Highlights

18 – 24 October 2026

International Lead Poisoning Prevention Week 2026 - From detection to prevention

Flagship Initiative against extreme heat and related environmental health risks in workplaces and major events

News

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30 September 2026

News release

WHO releases new guidance to prevent heat-related illness at mass gatherings

24 September 2026

Departmental update

From competencies to action: strengthening refugee and migrant health

22 September 2026

Departmental update

Advancing One Health implementation and investment: from country action to sustainable solutions

25 August 2026

Departmental update

People, animals, plants, ecosystems: making the case for investing in One Health

Events

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23 – 27 November 2026

Seventh WHO Global School on Refugee and Migrant Health

9 – 20 November 2026

COP31 Health Pavilion

International lead poisoning prevention week

18 – 24 October 2026

International Lead Poisoning Prevention Week 2026 - From detection to prevention

Speech

2 July 2026

WHO Director-General's opening remarks at the media briefing – 2 July 2026

Commentaries

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20 November 2025

World Toilet Day: Protecting health through safe sanitation

Videos

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31 August 2026

Meet Abdul-Fatawu Salifu, the newest ATACH Champion

25 August 2026

Beat the Heat: Staying safe at mass gatherings events

25 August 2026

Beat the Heat: Protecting health from extreme heat

Our strategy

WHO global strategy on health, environment and climate change: the transformation needed to improve lives and wellbeing sustainably through healthy environments

The new strategy is timely – it responds to and is in line with the 2030 Sustainable Development Agenda and the GPW13.

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Calls for

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18 September 2026

Call for consultant

Call for consultant – Health sector capacity on heat, air quality and health

18 September 2026

Call for consultant

Call for consultant – WHO Academy and capacity building

Publications

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Prevention and management of heat-related illness at mass gatherings: systematic reviews

Extreme heat is an increasingly important threat to health and operational continuity during mass gatherings. Climate change is increasing the frequency,...

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Prevention and management of heat-related illness at mass gatherings: considerations for implementation

Extreme heat is an increasing health, safety and operational risk for mass gatherings. It can cause heat-related illness, worsen chronic disease, increase...

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Prevention and management of heat-related illness at mass gatherings: developing evidence-based communication messages

Extreme heat is an important environmental and public health hazard. Exposure to high heat can cause heat-related illnesses and injuries and worsen underlying...

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children wash their hands under the supervision of a teacher

The WHO/UNICEF Joint Monitoring Programme (JMP) produces internationally comparable estimates of progress on drinking water, sanitation and hygiene (WASH)...

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