Over 200 is the purple (very unhealthy ... that’s allowing it to get into these valleys.” Colin said the air quality index ...

And authorities in Milan have entered into action mode. Pollution levels in Milan have spiked in recent days with the AQI or air quality index for the city reaching as high as 193 this past Sunday ...

Dhaka, the overcrowded capital city of Bangladesh, ranked sixth on the list of cities with the worst air quality with an AQI ...