From: damarkley@gmail.com   
      
   On Friday, October 9, 2020 at 10:47:30 AM UTC-4, dlzc wrote:   
   > Dear Dean:   
   > On Friday, October 9, 2020 at 4:46:43 AM UTC-7, Dean wrote:    
   > ...   
   > > I am well acquainted with ozone in my workplace.    
   > > We use UV lamps to cure coatings and inks. The    
   > > lamps are very good at generating ozone as a    
   > > byproduct. Every now and then, the exhaust    
   > > ducting would fail and operators would begin to    
   > > complain about headaches, eye irritation and    
   > > itchiness.   
   > The last two symptoms are probably NOx, more than ozone...   
   > > One trip to the affected area tells me immediately    
   > > what the problem is. We've measured levels from    
   > > 0.08 (max recommended over 8 hours) to 1.5 ppm (nasty).   
   > ... yes, it is amazing that your nose can "get used to" fairly high levels,   
   and not send out a warning.   
   > > Shutting down the lamps and getting maintenance    
   > > to fix the exhaust is an easy solution.   
   > Yes, I make ozone into water equipment, I just did not want to act like it   
   was safe to breathe.    
   >    
   > Not trying to claim you did not know what you were talking about. Just nice   
   to discuss actual "chemistry" here for a change.    
   >    
   > David A. Smith   
   Hi David, yes it is nice to have actual chemistry in here!  We had air   
   sampling done and results showed no NOx.  We did see a few ppm of N-vinyl   
   pyrrolidinone which is a component in one of the coatings we use.  That   
   prompted us to add extra ventilation    
   and a bit more enclosure.  We've been lobbying to replace the NVP for a few   
   years now but cost (the almighty $) keeps rearing it's head.  I suspect it'll   
   be forced on us as NVP will probably be banned here in the near future.   
      
   Cheers   
      
   Dean   
      
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