The daily CO2 level, measured at the Mauna Loa Observatory in Hawaii, was 399.72 parts per million last Thursday, and a few hourly readings had risen to more than 400 parts per million. (climatecrocks.com)
The embassy has been using Twitter to publish average hourly readings of particulate matter that's less than 2.5 micrometers in diameter (PM2.5): fine particles from combustion and industrial emissions that penetrate deeply into the lungs and are linked to heart disease and other health problems. (sciencemag.org)
One factor that facilitated their device's progress was the use of room temperature ionic liquid (RTIL), a gel that serves to stabilize the microenvironment at the skin - cell surface so that a week's worth of hourly readings can be taken without the performance degrading over time. (sciencedaily.com)