My PM levels are staying on 1 and won’t change. Is that correct? Abraham Gomez April 03, 2020 00:35 Updated If everything is clean, a PM indication of 1 should be correct. Related articles The Halo readings look a bit off. Are they accurate? My Halo didn’t update to the latest version. How can I update my firmware to the latest version? The air quality number on the app is jumping all over the place. The Halo is buzzing. Is it broken? How is the Wynd Score measured? Comments 2 comments Sort by Date Votes K1478625 July 04, 2021 04:58 Hi, mine is rangebound in single digits despite presence of 2nd hand cigarette smoke in the vicinity, should we be expecting much higher readings then? 0 Abraham Gomez July 06, 2021 19:32 Hello, thanks for the question. How well ventilated is the space and do you use an air purifier? Either of those could contribute to lower-than-expected PM levels. However, you can also perform a quick test on the Halo. To do this, you can blow some smoke from a cigarette or match directly towards the Halo to see if the PM values change as expected. If they do, it's working properly. If not, please contact firstname.lastname@example.org, and one of our team members will be able to help you. 0 Please sign in to leave a comment.