Hi, for anyone who cares about the air quality:
We have released a PM2.5 air quality monitor.
The features are summarized by one of our customers(amazon review):
"Quick Summary:
1. Nice battery operated display (no wires) with PM2.5 / ugm3, Max, 24-hour Max and 1hr Max PM2.5, 24-hour AQI color bar, temp and humidity, sensor battery level and sensor reception icon.
2. Quality/Accurate water-resistant Honeywell HPM partical sensor with rechargeable batteries and a solar panel (no wires). Sensor also has USB charge port, batteries last about 3 weeks without any charge, indefinitely with solar.
3. Useful Instruction Manual.
4. Responsive customer service."
If you're interested, you can visit this link to know more about it:
http://www.ecowitt.com/Other_Sensors/11.html