嚴重急性呼吸系統綜合症
The city attracted international attention in 2003 when it became the centre of a major Severe acute respiratory syndrome (SARS) outbreak. Public health attempts to prevent the disease from spreading elsewhere temporarily dampened the local economy. From August 14–17, 2003, the city was hit by a massive blackout which affected millions of Torontonians (it also affected most of Southern Ontario and parts of the United States), stranding some hundreds of people in tall buildings, knocking out traffic lights and suspending subway and streetcar service across the city during those aforementioned days.