A shame it's so short
The real issue with this tune is that it is only 30 seconds long. Without wanting to sound unfair or anything, it doesn't loop, so you've lost out on both aspects - if it were about 2-3 minutes long, it would be acceptable as a tune. Otherwise, if it was looping well, it wouldn't sound so... off.
I think that the tune that you've presented is nice, with a few bits and pieces that sound like you've thought about a Toxic Biohazard and how people responding to such an alert would be like. I think you've encapsulated that initial panic, but it's the aftermath that you want to take further and expand upon.
[Review Request Club]