What are the biggest health problems

Air pollution and climate change: Nine out of ten people on earth currently breathe polluted air every day. The WHO rates air pollution as the greatest environmental health risk. 90 percent of the resulting deaths occur in emerging and developing countries. Due to climate change, the WHO expects an additional 250,000 deaths from malnutrition, malaria, diarrhea and heat stress annually by 2050. / Photo: Getty Images / tommaso79

Non-communicable diseases such as diabetes, cancer and heart disease, mainly caused by obesity. According to the WHO, 70 percent of deaths worldwide are due to them, 85 percent of them in developing and emerging countries. Mental illness is also an issue: suicide is the second leading cause of death among 15 to 19 year olds. / Photo: Fotolia / JPC-PROD

The next big flu pandemic will come, the only question is when. 153 institutions in 114 countries are currently monitoring the global circulation and development of influenza viruses. / Photo: Fotolia / Fotowerk

Antimicrobial resistance is also a major concern of the WHO. The organization fears that previously controllable diseases such as pneumonia, gonorrhea or salmonella diseases will soon no longer be able to be brought under control. In 2017, the WHO counted 600,000 people with tuberculosis whose pathogens are resistant to the former first-line drug rifampicin. A global action plan aims to raise awareness of the rational use of antibiotics, antiparasitic, antiviral and antifungal agents. / Photo: imago / United Archives International

More than 1.6 billion people worldwide, almost one in four, live in crisis areas threatened by drought, famine, conflict and resettlement, combined with poor health care. Child and maternal mortality is often particularly high in these regions. The WHO wants to strengthen the health systems of the affected regions. / Photo: imago / Xinhua

Ebola epidemics occurred again last year, also in a conflict zone and in large cities. The WHO fears further outbreaks with such highly pathogenic agents, possibly also with previously unknown pathogens. / Photo: picture alliance / AP Photo

Even outside of crisis regions, the basic supply is not always available. At a conference in October 2018, all countries committed themselves in the so-called Astana Declaration to improve their primary health care. / Photo: Pharmacists help

One problem in industrialized countries is the growing skepticism about vaccinations - according to the WHO, they prevent two to three million deaths worldwide each year. Measles cases have risen significantly again recently, and the WHO also counts Germany among the problem countries. In 2019, the organization wants to further spread the HPV vaccination worldwide, among other things. / Photo: Fotolia / Kerkezz

Dengue infections are on the rise worldwide, not just in tropical regions. An estimated 40 percent of the world's population currently live in endemic areas. Around 390 million people are infected every year with the viruses that are transmitted by diurnal mosquitoes. The WHO wants to reduce the number of deaths by half by 2020. / Photo: Imago / UIG

Currently, 22 million people around the world are receiving antiretroviral treatment for HIV infection - another 15 million are left untreated. The WHO wants to change that too and is relying on more self-tests at home or at work. / Photo: Fotolia / natali_mis