// This is a global variable that's local to the player (so player x will have a different value than player y)
    zoneDamage = 0; // How much damage has been taken
    DAMAGE_LIMIT = 60; // The limit for the damage
    SLEEP_TIME = 1; // How often the game checks. Better performance if larger.



    // You can check the documentation for the function format but basically it's [script, sleep time, arguments to pass] call CBA_addPerFrameEventHandler
    [
    	{
    		params["_args", "_id"];

    		// Check if player is in the trigger area
    		if (player inArea trigger_name) then {
    			// Player is in zone

    			// Check if player is wearing mask
    			if !(goggles player isEqualTo "G_AirPurifyingRespirator_01_nofilter_F") then {
    				// Player is wearing mask so reduce the damage
    				if (zoneDamage >= 0) then {
    					zoneDamage = zoneDamage - SLEEP_TIME;
    				} else {
    					zoneDamage = 0;
    				};
    			} else {
    				// Not wearing mask, so increase time by sleepTime
    				zoneDamage = zoneDamage + SLEEP_TIME;

    				// If damage is >= limit, kill them
    				if (zoneDamage >= DAMAGE_LIMIT) then {
    					// player dies
    					player setDamage 1;
    				};
    			};
    		} else {
    			// Player not in zone so reduce the damage (or set to zero or something)
    			if (zoneDamage >= 0) then {
    				zoneDamage = zoneDamage - SLEEP_TIME;
    			} else {
    				zoneDamage = 0;
    			};
    		};
    	},
    	SLEEP_TIME,
    	[]
    ] call CBA_fnc_addPerFrameHandler;