India, June 4 -- As air quality advisories continue to engulf the Midwest following Canada wildfires, hundreds of thousands of people in four states have been told to stay indoors.

According to the EPA's (Environmental Protection Agency) AirNow map, which provides a real-time view of air quality, air pollution rates across Minnesota and portions of Michigan, Wisconsin, and Iowa are considered "unhealthy" on Wednesday.

The EPA and the National meteorological Service (NWS) advised people to limit their exposure to outdoor air following the deterioration of air quality due to wildfires and current meteorological conditions, which have pushed pollution levels into hazardous area in numerous cities.

The continuous warnings highlight the dan...