A wave of toxic air flowing in from Canada to the US has transformed three major cities into the most unbreathable places on Earth.
Stacy Liberatore is a US Science & Tech Editor at Daily Mail Online. She covers a wide range of topics including breaking discoveries, futuristic innovations, and various themes such as natural sciences, cybersecurity, and aviation. Stacy's work has been featured in outlets like This Is Money, The West Australian, and Health Industry Watch.











