एक दहन इंजन (combustion engine) द्वारा निम्नलिखित में से कौन से प्रमुख हानिकारक प्रदूषकों का उत्पादन किया जाता है?

Photochemical smog is brown in color and is often referred to as 'brown air smog'. This characteristic brown color is primarily due to the presence of:

Excessive runoff containing nitrates and phosphates into water bodies leads to nutrient enrichment, which is termed as: