I'm trying to integrate some public air quality data into my study. During a sanity check of the data I realized 3 of the measurement columns contain negative values! Does anyone have any idea if having negative value in such measurements is valid and how they should be interpreted?
Contacting the data manager is not as easy and might take me a week or two of emailing to get some answer. I wonder if #AirQuality folks here on fediverse have a quick answer.
