Smog formation involves complex chemical reactions in the atmosphere. Photochemical smog occurs when sunlight triggers reactions between NOx and VOCs, resulting in the production of ozone. This process is facilitated by high temperatures and sunlight, making it more prevalent in urban areas during the summer months. Sulfurous smog, or industrial smog, is formed primarily from burning fossil fuels, releasing sulfur dioxide (SO2) which then reacts with moisture in the air.
