प्राथमिक स्तर पर पर्यावरण अध्ययन (EVS) की प्रकृति को किस रूप में वर्णित किया गया है?

Prolonged occupational exposure to excessive noise from heavy machinery without hearing protection causes noise-induced hearing loss. Excess noise is categorized as a:

Long-term exposure to indoor air pollutants, such as smoke from burning biomass fuels, significantly increases the risk of developing chronic respiratory conditions like: