Canadian wildfires are set to hit New York City for a second time this week - which could lead to "hazardous" levels of air, officials have warned.
Residents will likely experience "very unhealthy" air on Wednesday and Thursday but will avoid the dark yellow haze that suffocated the city earlier this month.
Officials said the particles in wildfire smoke can irritate the eyes, nose and throat and can affect the heart and lungs, making it harder to breathe.
