प्राथमिक स्तर पर पर्यावरण अध्ययन (EVS) का पाठ्यक्रम मुख्य रूप से किस पर आधारित 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: