As many as 52 fire tenders were at work to spray water on trees in Delhi from noon to 4 pm today, said an official from the department.
The exercise would also continue tomorrow, he added.
In Delhi, pollutants touched calamitous levels as a thick grey smog hung low across the region over the past few days, prompting the authorities to take a number of steps, including the rolling out of odd-even car rationing scheme from November 13.