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Concerned passengers look as a woman in a white coat assists an old man with chest pain on a crowded bus at night.
A man holding a cigarette between his fingers, holding his chest, heart attack, chest tightness, dangers of smoking, no smoking, stop smoking, cardiac arrest
Distressed older man struggling with unbearable heat, using fan to relieve suffocation and nausea. Heat stress impacting health, lack of air, cardiovascular pressure, unwell in sweltering home
Military drones flying in the night sky, bullet tracers, an explosion in the air
Smoke fuming in the air during the September 11 terrorist attack at the World Trade Center, New York City.

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