4 ms·
Dust generally is bad, too. EDITING to provide source because I was downvoted. All types, including rail dust: https://www.railway-technology.com/features/feat
by Robotbeat 5y ago
Dust generally is bad, too.
EDITING to provide source because I was downvoted. All types, including rail dust: https://www.railway-technology.com/features/feature-air-in-underground-subways-harming-health/ https://www.railway-technology.com/features/feature-air-in-u...