How to build your own air quality meter with a Raspberry Pi and CO2 sensor A reliable indicator of the air quality in offices, classrooms, or living rooms is the CO2 content.
In fresh air, the concentration of carbon dioxide is around 400 ppm. This stands for “parts per million”, in this case 400 CO2 molecules per million air molecules. Although this is only 0.04 per... 
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Annual Channel migrant crossings highest since 2022 The 2025 total is the highest since 2022, when nearly 46,000 migrants made the crossing. 
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Spectacular New Year's Day sunrises from across England BBC Weather Watchers capture the moment the sun comes up in 2026 across the East of England. 
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Netherlands police face 'unprecedented' New Year's violence Reports of fireworks and other explosives being thrown are widespread across the country. 
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Amber snow and ice warnings issued as Arctic air spreads across the UK Colder weather with snow and ice warnings in force will continue over the next few days. 
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BBC reports from the scene of Swiss resort bar fire The BBC's Silvia Costeloe says the bar where the fire broke out has been around for at least 40 years, and is considered an institution in the area. 
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Gladiator Giant to revert to birth surname... Bigg Jamie Christian-Johal said his recent divorce and ADHD diagnosis prompted the move. 
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Stranger Things draws to an epic and emotional close Fans gathered at premieres in cities across the US and Canada to watch the finale on the big screen. 
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Cyber expert gets rare Australian visa by hacking the government The self-taught British security researcher found a unique way to beat 99 per cent rejection odds for the elite visa. 
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Johnson to hold talks with Palace boss Glasner Brennan Johnson will meet Crystal Palace manager Oliver Glasner on Thursday before making a final decision on whether to complete a £35m move from Tottenham. 
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Maresca leaves Chelsea after turbulent end to 2025 Chelsea boss Enzo Maresca leaves his role with the club fifth in the Premier League - 15 points adrift of leaders Arsenal. 
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UK to 'robustly defend' stripping Begum of citizenship in European court, source says The ECHR questions whether it was considered if Shamima Begum was a victim of grooming and trafficking. 
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US military says five killed in latest strike on alleged drug boats The latest strike comes as the US Coast Guard searches for survivors of another that happened a day earlier. 
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Dad pays tribute to 'wonderful family' killed in Boxing Day fire Tom Shearman pays tribute to his wife and two children after a fire engulfed their home. 
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What we know so far about how the fire broke out Several dozen people are presumed to have died in the fire at a New Year party in the resort of Crans-Montana. 
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‘We do want a third day’: McGrath Foundation counting on you, Albanese tells Australia’s cricketers Prime Minister Anthony Albanese has urged Australia and England players to ensure the SCG Test lasts longer than the two-day affairs in Perth and Melbourne earlier in the Ashes series. 
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Neighbourly informed of potential data breach The community website is investigating and it is not known if the claims are real. 
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Crypto users forced to share account details with tax officials The move is designed to ensure people pay all relevant tax on buying and selling crypto. 
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I always wanted Paul Mescal to play Shakespeare, says Hamnet writer Hamnet author Maggie O'Farrell says the Irish actor "stood out a mile" long before break out Normal People role. 
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