Sri Lanka, Nov. 12 -- Schools in Delhi have been asked to run hybrid classes for primary students and non-essential construction activity has been banned as air quality worsens in the Indian capital.

On Tuesday, authorities enforced stricter anti-pollution measures which include limiting movement of goods carriers in the capital and its suburbs.

Delhi's air quality has deteriorated to "severe" levels according to authorities, which can affect healthy people and seriously impact those with existing diseases.

On Wednesday, the capital's PM2.5 levels in the air reached 438, according to the Central Pollution Control Board - dangerously high concentrations of fine particles that can clog the lungs.

This is nearly 30 times higher than the ...