Which forms the part of hazy fumes of photochemical smog

Photochemical smog is formed when the pollutants in air react with the sunlight. The sunlight converts the pollutants into chemicals. So when sunlight reacts with nitrogen oxide in atmosphere, the smog is produced which is visible as a brown haze specially during morning and afternoon. It can cause health problems like nose and throat infection and severe headache ENVIRONMENTAL CHEMISTRY 27