All news on the topic: Toxic smog

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Two children among five people killed as truck crashes and spills toxic gas
Emergency services were still on the scene near Teutopolis, Illinois, to try and contain the cloud of anhydrous ammonia that emanated from the overturned tanker late Friday evening
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Map shows Chicago's air quality amid second wave of Canadian wildfire smoke
A second wave of northerly winds has wildfire smoke billowing into the US from Canada once again — and this time, it's hitting Chicago the hardest
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Experts explain whether you should wear a mask amid Canadian wildfires
Americans have started masking again amid the wildfire smoke drifting across the Canadian border. Experts are weighing in on the effectiveness of the devices
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School kids in New York city told to stay home another day over wildfire smog
New York City Public Schools has asked pupils to stay home tomorrow as smoke from the wildfires in Canada continue to affect swathes of the US including major cities
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Dramatic map tracks path smoke from wildfires will take across the US
The maps show the spread of smoke across the US as wildfires in Canada continue to rage. The FAA has been forced to temporarily ground flights as visibility makes safe take off impossible
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Truck driver dead and toxic cloud released after hazmat spill forces evacuation
The truck carrying toxic nitric acid overturned on the I-10 in Arizona, US, sending a cloud of gas into the air which could be seen five miles away