प्राथमिक स्तर पर एक अच्छा ई.वी.एस. (EVS) पाठ्यक्रम मुख्य रूप से किस पर केंद्रित होना चाहिए?

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: