Product smelled old. Like it had been on the shelf too long.My Backyard backs up into the woods with dense Palm, Pine, Oak, Maple and Cypress Trees. Also low lying Palmetto bushes. So, the pollen count is well above 10 during the spring. We use this in our diffuser daily and it makes all a ton of difference. We have energy, no headaches and can breath without a runny nose! Highly recommend.I use this in my diffuser and on my floor steam mop pads. The scent lasts for hours and my home smells so clean. We have cats and if they use their litter box and an odor starts I know I can turn on my diffuser and the bad smell will be neutralized quickly. It doesn't mask the odors it gets rid of them. I would recommend this oil! Just remember a little goes a LONG way!I have a secret to share. I bought wool dryer balls and I put drops of essential oils on them and my clothes come out of the dryer smelling awesome. The scent lasts a long time and it's a purifying essential oil blend. It’s a win! Win!There is nothing else quite like this on the market. I've tried other respiratory blends and they just don't do it for me like this. I have hereditary emphysema + asthma and terrible allergies. I almost always swipe some of this right under my nose before resorting to other measures. I also use this in my diffuser to clear my home of irritants. It's particularly good at easing my breathing when I'm near smokers and can't escape the situation. A bit of this under my nose and my hand held portable nebulizer are a winning combination. I keep a bottle on me at all times. I wish it were a bit more cost effective but I'll never be without it, regardless.I really like NOW oils - they were the brand that I went with before this really big essential oils craze that we seem to be having right now. I use this Clean the Air scent with my ultrasonic diffuser.I do like the scent overall, it's very minty - maybe a combination of peppermint, spearmint, and maybe eucalyptus as well. The one thing I don't like is that it seems like there's less oil in these mixes and more liquid. When I put in the drops of this scent into the water, it oils up the surface a bit, but not nearly as much as if I put straight essential oils in there. As such, it really feels like this scent dissipates in the mister much more quickly than when using just oils. It feels like I have to put more of this in to get the same amount of scent.I think I'll stick with straight oils from here out.I bought this for my mom who has sinus issues. She does a lot of coughing and we noticed she either coughs less or not at all when using this scent. It is something I buy all the time for her and she uses her diffuser daily. It isn't hard to clean out of the device which is a win for me.This is by far my favorite clear the air essential oil. Most of them put Teatree oil in and it’s too strong for me. I’ve bought this several times now!