suffocating (adj.)

• airless
• breathless
• close
• crushing
• humid
• muggy
• oppressive
• penetrating
• pungent
• reeking
• sharp
• smashing
• smothering
• smudgy
• sticky
• stifling
• strong
• strong-scented
• strong-smelling
• stuffy
• sultry
• unvented
• unventilated
• windless