"poor-air-quality"

The findings showed that acute concentrations of fine particles, especially those smaller than 2.5 micrometres, cause inflammation of the respiratory, pulmonary and cardiovascular tracts and thicken the blood.

Doctors warn that even those who have had COVID-19 in the past are not out of the woods.

The city recorded an air quality index (AQI) of 315 at 11:10 am. The last time the air quality hit such a poor level was in February.