![A Swiss Air Force F-5E Tiger aircraft returns in Payerne after a radioactivity measurements flight over Switzerland March 23, 2011. An aerosol collector is located under each wings of the aircraft and A Swiss Air Force F-5E Tiger aircraft returns in Payerne after a radioactivity measurements flight over Switzerland March 23, 2011. An aerosol collector is located under each wings of the aircraft and](https://c8.alamy.com/compfr/2e693tr/a-swiss-air-force-f-5e-tiger-aircraft-returns-in-payerne-after-a-radioactivity-measurements-flight-over-switzerland-march-23-2011-an-aerosol-collector-is-located-under-each-wings-of-the-aircraft-and-filters-the-air-to-collect-fines-particles-at-an-altitude-of-10000-meters-32808-feet-to-15000-meters-49212-feet-the-federal-office-of-public-health-foph-has-been-conducting-flights-on-a-regular-basis-in-the-past-years-to-monitor-the-radioactivity-but-due-to-the-situation-in-japan-decided-to-increase-them-until-end-of-march-2011-the-results-are-not-known-yet-reuters-denis-balibouse-2e693tr.jpg)
A Swiss Air Force F-5E Tiger aircraft returns in Payerne after a radioactivity measurements flight over Switzerland March 23, 2011. An aerosol collector is located under each wings of the aircraft and
![A worker installs solar panels on the roof of the Palexpo Exhibition Center in Geneva October 12, 2011. Once finished, it will be the biggest solar farm in Switzerland with 15,000 photovoltaic A worker installs solar panels on the roof of the Palexpo Exhibition Center in Geneva October 12, 2011. Once finished, it will be the biggest solar farm in Switzerland with 15,000 photovoltaic](https://c8.alamy.com/comp/2D0GN3M/a-worker-installs-solar-panels-on-the-roof-of-the-palexpo-exhibition-center-in-geneva-october-12-2011-once-finished-it-will-be-the-biggest-solar-farm-in-switzerland-with-15000-photovoltaic-panels-covering-a-surface-of-48000-square-meters-516000-square-feet-and-producing-for-the-industrial-services-of-geneva-enough-electricity-to-power-1200-households-reutersdenis-balibouse-switzerland-tags-environment-energy-2D0GN3M.jpg)
A worker installs solar panels on the roof of the Palexpo Exhibition Center in Geneva October 12, 2011. Once finished, it will be the biggest solar farm in Switzerland with 15,000 photovoltaic
![Solar panels are pictured on the roof of the Palexpo Exhibition Center in Geneva October 16, 2012. The Palexpo Exhibition Center is the biggest solar farm in Switzerland with 15,000 photovoltaic panels Solar panels are pictured on the roof of the Palexpo Exhibition Center in Geneva October 16, 2012. The Palexpo Exhibition Center is the biggest solar farm in Switzerland with 15,000 photovoltaic panels](https://c8.alamy.com/comp/2CXGTXN/solar-panels-are-pictured-on-the-roof-of-the-palexpo-exhibition-center-in-geneva-october-16-2012-the-palexpo-exhibition-center-is-the-biggest-solar-farm-in-switzerland-with-15000-photovoltaic-panels-covering-a-surface-of-48000-square-meters-516000-square-feet-and-produces-for-the-industrial-services-of-geneva-enough-electricity-to-power-1350-households-reutersdenis-balibouse-switzerland-tags-energy-environment-business-2CXGTXN.jpg)
Solar panels are pictured on the roof of the Palexpo Exhibition Center in Geneva October 16, 2012. The Palexpo Exhibition Center is the biggest solar farm in Switzerland with 15,000 photovoltaic panels
![A Swiss Air Force F-5E Tiger aircraft lands in Payerne after a radioactivity measurements flight over Switzerland March 23, 2011. An aerosol collector is located under each wings of the aircraft and A Swiss Air Force F-5E Tiger aircraft lands in Payerne after a radioactivity measurements flight over Switzerland March 23, 2011. An aerosol collector is located under each wings of the aircraft and](https://c8.alamy.com/compfr/2cxj5n6/a-swiss-air-force-f-5e-tiger-aircraft-lands-in-payerne-after-a-radioactivity-measurements-flight-over-switzerland-march-23-2011-an-aerosol-collector-is-located-under-each-wings-of-the-aircraft-and-filters-the-air-to-collect-fines-particles-at-an-altitude-of-10000-meters-32808-feet-to-15000-meters-49212-feet-the-federal-office-of-public-health-foph-has-been-conducting-flights-on-a-regular-basis-in-the-past-years-to-monitor-the-radioactivity-but-due-to-the-situation-in-japan-decided-to-increase-them-until-end-of-march-2011-the-results-are-not-known-yet-reuters-denis-balibouse-s-2cxj5n6.jpg)