Home > News

WMO: SunSmart Global UV App launched

Source:WMO23-06-2022

Geneva, 21 June 2022 - A new app for mobile phones that provides localized information on ultraviolet (UV) radiation levels has been launched by the World Health Organization (WHO), the World Meteorological Organization (WMO), the United Nations Environment Programme (UNEP) and the International Labour Organization (ILO). The SunSmart Global UV app provides five-day UV and weather forecasts at searchable locations. It highlights time slots when sun protection is required with the aim of helping people around the world know when to use sun protection, in an effort to reduce the global burden of skin cancer and UV-related eye damage.

The SunSmart Global UV app is available free of charge at both the Apple App and Google Play stores. It provides personalized options so that users can take actions to protect prolonged, excessive UV exposure, a major cause of skin cancer and other UV related diseases. The app allows the inclusion of national and local data streams and adaptation to multiple languages – it is currently available in Chinese, English, French, Russian, Dutch and Spanish.

“Evidence shows that overexposure to UV is the major cause of skin cancer. So it’s vital for people to know when and how to protect themselves,” said Dr Maria Neira, WHO Director, Department of Environment, Climate Change and Health. “We encourage everyone to use the application to  protect themselves and their children, and to make this a daily habit.”

The UV App has been launched to coincide with the first day of summer in the northern hemisphere. By increasing the public’s awareness and helping to reduce the incidence of skin cancer, this application ultimately supports the achievement of UN Sustainable Development Goal 3, which aims to ensure healthy lives and well-being worldwide by 2030.

“This app combines meteorological, environmental and health expertise to help protect people from the sun both at work and in their leisure.  It is unique because it uses data from country-level weather and UV measuring stations to provide accurate and location-specific UV Index readings,” said WMO Secretary-General Professor Petteri Taalas. “It is a great example of science serving society.”

The EU’s Copernicus Atmospheric Monitoring Service feeds into the global UV app.

Its director Vincent-Henri Peuch said: “Now is the period of the year when UV radiation is at its maximum in Europe and in the Northern Hemisphere due to the position of the sun in the sky. However, there are other factors that influence the amount of UV that reaches the ground including clouds, the ozone layer, the presence of particles in the atmosphere and the altitude of the location or the type of surface.

All these elements are taken into account in the forecast model that we operate at ECMWF for the Copernicus Atmosphere Monitoring Service and which feeds into the WMO Global UV App.

Information of the general public with the most accurate data possible is essential, as excessive exposure to UV radiation is responsible for severe health issues. At present, large parts of Europe can experience UV index values in excess of 8, which is a “Very High” rating and means that a sunburn can occur in as little as 15 minutes depending on the type of skin.


Globally, it is estimated that over 1.5 million cases of skin cancer (melanoma and non-melanoma combined) were diagnosed globally in 2020. During the same period, more than 120,000 people across the world lost their lives to this highly preventable disease. One of the main factors contributing to these cancers is excess UV radiation from thinning of the earth’s stratospheric ozone layer resulting from the release of certain manmade chemicals. Under the international treaty known as the Montreal Protocol, all UN Member States are phasing out the production and consumption of those substances according to a specific timetable. As a result of these continuing efforts, the ozone level is projected to recover by mid-century. In the meantime, individuals need to be particularly cautious to protect themselves from receiving too much UV exposure - this is where the UV app plays an important awareness role.

“The Montreal Protocol protects the stratospheric ozone layer which, in turn, protects human health and the environment by blocking most of sun’s harmful ultraviolet radiation from reaching the earth’s surface. Skin cancer can result from overexposure to the sun, so it is imperative for everyone to remain vigilant and ensure they protect themselves adequately with hats and sunscreen. The SunSmart App is a fantastic UV monitoring tool, and I would encourage everyone to use it,” advises Ms. Meg Seki, Executive Secretary of the Ozone Secretariat.

Everyone needs some sun, mainly for the production of vitamin D which helps to prevent the development of bone diseases such as rickets, osteomalacia and osteoporosis. But too much sun can be dangerous – and even deadly.  The summer months hide real danger.

Much of UV-related illness and death can be avoided through a set of simple prevention measures:

Limit time in the midday sun

Seek shade when UV rays are most intense

Wear protective clothing, hats and sunglasses

Use a broad-spectrum sunscreen of sun protection

Protecting children from extended periods in the sun is particularly important as excessive sun exposure during these early years can significantly increase the risk of UV related diseases later in life.

“This app is a useful tool to assist companies and workers in identifying hazardous work and planning safety and health measures. The International Labour Conference adopted on 10 June a Resolution recognizing a safe and healthy work environment as a new Fundamental Principle and Right at Work. It is a global call for increased efforts to prevent work-related injuries and diseases. Tools such as SunSmart Global UV are a small but useful contribution to this endeavour,” said Vera Paquete-Perdigão, Director of the ILO’s Governance and Tripartism, Department.


The app is based on the UV Index, which describes the level of solar UV radiation at the earth’s surface. The UV Index is reported on a scale of 1 (or “Low”) to 11 and higher (or “Extreme”). The higher the index value, the greater the potential for damage to the skin and eye, and the less time it takes for harm to occur. The maximum UV Index is at the solar noon when the sun is highest in the sky. Adapting outdoor activities and using sun protection are recommended when the UV Index is 3 or above. UV damage is cumulative and UV can be harmful when people are exposed for long periods – even at low levels.

The app seeks to bring worldwide consistency to UV reporting and public health messaging. It was developed by the Cancer Council Victoria and the Australian Radiation Protection and Nuclear Safety Agency, both WHO Collaborating Centres in Australia where a similar app demonstrated improved UV protection public awareness when it was used to support a decades-long, systematic public health campaign promoting sun-smart behaviour. 

The Global Solar UV Index was developed jointly by the World Health Organization (WHO), the World Meteorological Organization (WMO), the United Nations Environment Programme (UNEP), the International Commission on Non-Ionizing Radiation Protection (ICNIRP) and the German Federal Office for Radiation Protection (Bundesamt für Strahlenschutz, BfS) to inform and alert the general public of the potential health risk associated with high UV solar radiation levels.

Editor: Liu Shuqiao