Drone footage shows New York City in a blanket of smoke from Canada wildfires – video

Tens of millions of people in the US are under air quality alerts as smoke from the Canadian wildfires drifts south, turning the sky in some of the country's biggest cities a murky brown. In New York City, residents were advised to limit their time outdoors, as public schools cancelled outdoor activities

• Tens of millions under air quality alerts in US as Canada fire smoke drifts south