“Fog incidence this year has been higher than in previous years, largely due to increased pollution levels and prevailing climatic conditions, including scanty rainfall in December. The persistence of dense fog has cascading effects on many sectors including daily life by reducing visibility, slowing road, rail and air transport, and increasing accidents and delays,” said Harminder Pal Singh, chairperson, department of environment studies, Panjab University. “It also affects economic activity, causes power line tripping and outages and worsens respiratory health due to pollution.”