You've probably seen this weird metal box while riding the New York City subway at some point. I remember thinking the first time I saw one that it certainly looked suspicious, and I couldn't figure out what it could be used for. Redditor Jak0zilla recently figured out what they were:
Outdoor Rated, Continuous Duty, Mobile Cart Air Sampling Systems: This extremely popular, outdoor rated continuous duty air sampling system is intended for secure outdoor ambient particulate and/or gaseous air sampling. The pump, control valve, and control panel are all hard mounted in a heavy gauge TIG welded aluminum, fully lockable, fan cooled, weather proof enclosure.
Turns out they actually cares about the air down there in the subway! Thanks MTA!
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