Enjoy sunlight wisely
Clear, practical answers on using sunlight and staying protected. The app is in development and is planned to help people choose when to go outdoors, prepare for sun protection and adapt routines to seasonal sunlight.
What we are building the App to help with
When sun protection is needed
See the periods needing sun protection, and when to wear a hat, seek shade and protect your skin and eyes.
For example: on a summer day in Beijing, suppose the forecast shows periods with a UV Index at or above 3 in both the morning and afternoon. The App would flag them and remind you to wear a hat and use sun protection. Prompts would update as the forecast changes.
See when sun protection is neededChoosing a time to go out
Check temperature and UV together to choose a more convenient, comfortable time to head out.
For example: the morning is cooler with lower UV, while the afternoon is hot with stronger UV. Consider the morning for a walk. This helps choose a walking time; conditions for vitamin D production in the skin would be explained separately.
What to know about sunlightWhat to watch for as seasons change
On shorter days, rethink your walking time; when seasonal sunlight is limited, pay more attention to foods containing vitamin D.
For example: the local daily maximum solar elevation is below 30°. The App would prompt you to check your usual foods for vitamin D: check the fish species when shopping, and whether milk or plant drinks are fortified. You can still plan daytime walks.
See how to adjust as seasons changeWhen to go out today and what to bring
A UV Index number is more useful when you know what it means for going out. For your chosen city, the App will show periods needing sun protection and remind you to prepare clothing, hats and sunscreen, and look for shaded routes.
Check both temperature and UV when choosing a walking time. If the morning is cooler with lower UV, consider it first. In heat or thunderstorms, change the time or stay indoors. Conditions for vitamin D production in the skin also depend on season, solar elevation and other factors, not just comfort.
See how to compare morning and afternoonWhat to change when the days get shorter
On short winter days, it may be dark by the time work ends. Move a walk to a daylight period, such as lunchtime, and prepare for the day’s UV and weather. The App will also use the local season to prompt you to check for vitamin D sources in your meals.
When the local daily maximum solar elevation is below 30°, the App will prompt you to pay more attention to foods containing vitamin D, such as suitable fish, eggs and fortified foods. Food information will be available throughout the year; you need not wait for a prompt.
See meal ideasSee the advice and the reasons
In the App, you will be able to check sunlight, weather and dates for your chosen city, along with data sources and update times. No registration is planned. Changing cities will update the other pages too; fully closing and reopening will restore the default city.
The App is still in development and is not yet available to download. We will announce its features and download details at launch. The examples here explain what we are building to help with.
Learn how to check information