Communities south of the U.S.-Canada border reported air quality index (AQI) readings between 200 and 400 – levels which are considered to be unhealthy to even hazardous.

The air quality was recorded in the 'satisfactory' category at 9 am on Sunday, with an Air Quality Index (AQI) reading of 82, ...

As of 8 a.m., multiple air quality sensors are reporting readings in the “Unhealthy for Sensitive Groups” (AQI 101–150) to “Unhealthy” (AQI 151–200) range.

Dust pollution in Delhi surged overnight, pushing AQI above 200 into the 'poor' category, with visibility dropping sharply due to strong, dust-laden winds.