Continuous methane measurements from the University of Utah tower and the Utah Division of Air Quality network across the Salt Lake Valley. All times are local standard time (UTC-7, no daylight saving). Values are calibrated and quality controlled.
Daily and monthly means are built from hourly means, so sites with different instrument sampling rates are weighted equally.
Ten-minute means, the most recent data in the archive.
Hour-of-day median with the interquartile range shaded. The median rather than the mean, because the distribution is strongly right-skewed and a mean hides how often an hour is quiet. Pick a site to compare its groups.
Percent of each month with a valid hourly mean. Gaps are instrument downtime.