5 ms·

How do you know if that soot came from exhaust, tyres, or something else ?

• hinkley 7y ago
  We moved a young coworker into a first floor appt in downtown and there was black soot on all the windowsills. I taught him about soap and vinegar and we suggested an air filter and being judicious with opening the windows, or finding a window fan with a prefilter. It had just not occurred to me that the busses and trucks were pumping out that much soot in the modern era.
  • pas 7y ago
    It's not always soot, a lot of it is also simply dust.
• gpapilion 7y ago
  You could see it was tiny sticky pieces of rubber.