Northern India is experiencing a chilly spell with fog and frozen lakes.

With temperatures in several states close to zero, a severe cold wave has strengthened its hold on much of northern India. Delhi, the nation’s capital, saw the coldest morning of the season on Thursday, with a low of 2.9C. Some parts of the adjoining state of Haryana reportedly experienced temperatures below 1C, and images of automobiles and bikes encased in frost went popular on social media.

According to the weather service, the cold weather has been around for four days and is predicted to last until Friday. When minimum temperatures in the northern Indian plains drop below 4C, it’s called a cold wave. Flight schedules have been affected by the weather, and some train services have been cancelled. Due to poor visibility, Delhi airport alerted travellers of potential delays early on Thursday.

The majority of dwellings in the plains of India lack central heating and are not built to withstand the severe winters. The chilly spell coincides with the dangerous air quality that persists in several cities throughout the region. Low temperatures during the winter keep contaminants near the ground, which impairs visibility and raises pollution levels. Breathing issues may result from this, especially in sensitive populations including children, the elderly, and people with pre-existing medical illnesses.