पर्यावरण अध्ययन (EVS) में, निम्नलिखित में से किस अभ्यास द्वारा सार्थक अधिगम (meaningful learning) प्रदान नहीं किया जा सकता 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: