Delhi faced a severe environmental crisis as the AQI hit hazardous levels in multiple areas. In response, the Delhi Police enforced vehicle checks and a ban on older diesel vehicles to combat air pollution,

India's capital was left gasping this week as air pollution smog reduced visibility to near zero and raised air quality levels more than 130 times safe limits.

Residents in India's northern states woke up to another day of poor air quality on Tuesday, as a layer of dense fog shrouded most of the region, and pollution in the capital Delhi remained severe.