Low visibility during cold weather can be due to:
C
smoke from industries and vehicles
Correct option is C. both A and B
During cold weather, water droplets instead of moving up at a higher altitude stay near the earth's surface and cause fog. Along with this, a lot of vehicular emissions and smoke from industries contain oxides of nitrogen which combine with other air pollutants and fog to form smog.
The smog causes breathing difficulties such as asthma, cough and wheezing in children. Also as they both remain suspended in the air causing the visibility to reduce during cold weather.