CAB installs PM2.5 monitor
The Clean Air Board announced that it has installed a new air quality monitor in downtown Carlisle near the Square. The PM2.5 sensor will report its readings 24 hours a day. The real-time data can be viewed on the PurpleAir network. The PurpleAir™ sensor is a device that uses two laser particle counters to capture and record data about microscopic particulate matter (PM2.5) suspended in the air. The sensor uses WiFi connectivity to display real-time air quality readings on the PurpleAir™ Map, which is a world-wide map of monitors where data can be shared with the public.



Over the past several weeks, NASA satellite measurements have revealed significant reductions in air pollution over the major metropolitan areas of the Northeast United States. Similar reductions have been observed in other regions of the world. These recent improvements in air quality have come at a high cost, as communities grapple with widespread lockdowns and shelter-in-place orders as a result of the spread of COVID-19. 
