Researchers from the London School of Economics (LSE) have launched an iPhone app to track happiness levels across the UK.
The project will help researchers understand how people's feelings are affected by their immediate environment, including factors such as pollution, noise, weather conditions and green space.
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The Mappiness app pings users daily to gauge how they are feeling, locating their geographical position through GPS.
Richard Layard, director at the LSE's Centre for Economic Performance, said, "[This] is the best method so far devised for understanding how people's emotions are affected by the buildings and natural environment in which they move."
National happiness levels are updated in real-time on the project website, alongside maps and timelines derived from the response data.