Mystery as major US city is hit by public health emergency with toxic chemicals filling the air

More from Science & Technology

• REVEALED: The UFO sightings taken seriously by the US government

• Scientists discover just 19 bites of popular 'health' food per week could kill you

• Mystery of the 'Dial of Destiny' is SOLVED after 2,000 years: Scientists finally uncover the true use for the ancient device that inspired Indiana Jones

• Experiments to dim the SUN in bid to curb global warming will be approved by the UK government within weeks

• Vatican's secret links to UFOs laid bare as Pope Francis' successor is urged to share 'the truth'

• NASA scientists are BAFFLED after spotting a mysterious 'Skull Hill' on Mars

• Google Pixel 9a review: Engaging AI features and mighty battery life give Apple's 'budget' iPhone a run for its money

• The 6 most common dreams - and what they REALLY mean

• Top secret US spy drone gets deadly laser that MELTS missiles mid-air amid fears of World War III

• Urgent recall for mushrooms sold throughout US that could kill children and pregnant women

• Mysterious vehicle found in sunken WWII aircraft carrier

• Shocking reason Elon Musk 'threatened me with deportation'

• Now conspiracy theorists claim the door on the Blue Origin ship was FAKE - as they continue to insist Katy Perry's entire launch was staged

• Terrifying video reveals what could happen when massive US volcano erupts... as city of 300k braces for impact

• People left 'mindblown' after learning how tin foil improves your Wi-Fi

• Steam spotted billowing from massive US volcano as American city braces for imminent eruption

• Who will be the next Pope? AI predicts the new head of the Roman Catholic Church after Pope Francis dies

• New AI Chibi figure trend is taking over social media - here's how you can transform into a pocket-sized toy

• Dog owners rate their bond with their pet as MORE satisfying than their relationships with their friends, partner and even their children, study finds

• Scientists are BAFFLED after spotting a lone black hole drifting through space - with no star orbiting it