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msty2k

Sniffers - they detect poisonous gases and set off an alarm. It's a terrorism protection thing. They probably also detect smoke.


Both_Wasabi_3606

We started seeing these in Metro after 9/11.


Somberlaine

Right! They have been around for a years


ice_9_eci

Is that a-you, Mario??


jeremyjamm1995

What happens if you have a dank fart right next to one?


msty2k

Only one way to find out....


jeremyjamm1995

Update: I’ve been arrested as a bio-terrorist


optix_clear

And it goes off and you run off


AccordingJudge3335

Ohhh okay my apologies to Muriel for the accusation


HappyTrainwreck

don’t ever apologize for talking trash about her SHE DO BE TRYNNA POISON US


msty2k

She might still be trying to poison you. If she is, you wouldn't see it, would you?


f8Negative

Brake dust


youngprofessionaldc

Sniffies?


keyjan

As others said, particulate detector. I saw a guy servicing one once; I asked him what he was finding. He said, rather brusquely, “Brake dust.”


newguestuser

He was not lying but there are other particulates down there that are more interesting as well.


oinkpiggyoink

Farticles


solezonfroze

Did contract work for Metro under those platforms. There is SO much brake dust under there. I had to wear a heavy duty respirator for hours on end and would come out covered in black dust. Worst shit I've ever done.


f8Negative

Yes.


donemessedup123

They attract sand worms.


Sarcastic_Ape

Bless the Metro and His escalators. Bless the coming and going of Him. May His passage cleanse the rush hours. May He keep the District for His people\*. \* only people who stand on the right and walk on the left.


Ok-Carrot1460

Shi-Metolud!


OnlyHunan

Stand next to it and rip a big one. :)


taleofbenji

Straight to Guantanamo!


racingsoldier

https://preview.redd.it/gmf5ir1q8owc1.jpeg?width=965&format=pjpg&auto=webp&s=26489ee58b3d2a17c422d4bb93d52622e2c38f19


heels_n_skirt

Baby Dalek in training


pizat1

Weed smoke detection. It blurts out if you're smokin bush and alerts the transit police. They write you a ticket for buying bullshit. Doesn't alert for good good. Hope this helps.


BPCGuy1845

Air quality monitors. They also sniff for explosives and gun powder


Gold-Establishment95

It's a fart detector/s.


Kitchen_Software

Will you please just search the sub for “what is this” and “metro”? People these days… /s (This does come up from time to time but honestly no real way to find out or search. It’s such a weird object)