What our DL-PM has seen since 2020
/Almost six years of continuous data — from a single DL-PM | Particulate Matter, Temperature, Humidity and Barometric Pressure Sensor for LoRaWAN® in Dübendorf. Measuring PM1, PM2.5, PM4, PM10 — plus temperature, humidity, and barometric pressure. Every 10 minutes, around the clock.
Almost six years on, every season has left its trace.
Winter brings the most dramatic peaks — sharp New Year's Eve spikes from fireworks, and stubborn inversions that hold PM elevated for days at a time. The highest New Year's Eve PM concentrations in our dataset were in 2021/22. Other years were notably smaller. Weather, wind, and human behavior all leave their trace.
Spring and summer look calmer at first glance — but never flat. Traffic, construction, secondary aerosols, Saharan dust transport, and increasingly, wildfire smoke from southern Europe all show up. Just without the winter extremes.
Year-round, temperature and humidity trace clean annual cycles — six clean waves, same sensor, same site. The kind of validation you only get from multi-year continuous measurement.
No recalibration. No maintenance worth mentioning. Just the air, quietly recorded and sent wireless over LoRaWAN® 24/7.
Key facts
Sensor: DL-PM (PM1 / PM2.5 / PM4 / PM10 + temperature, humidity, barometric pressure)
Running since: July 2020
Measurement interval: 10 minutes
Power: 2× alkaline C batteries + external 5V supply for PM module
Maintenance: almost none
Full specs, accuracy ranges, payload format and more in the datasheet.
→ Download DL-PM datasheet
Explore real-time data from this sensor on our demo site.
→ Visit DL-PM real-time demo
