Topic summary
Air pollution sensor
Extracted from the Wikipedia article Air pollution measurement.
Personal air quality sensors
At one end of the scale, there are small, inexpensive portable (and sometimes wearable), Internet-connected air pollution sensors, such as the Air Quality Egg and PurpleAir. These constantly sample particulates and gases and produce moderately accurate, almost real-time measurements that can be analyzed by smartphone apps. Their data can also be used in a crowdsourced way, either alone or with other pollution data, to build up maps of pollution over wide areas. They can be used for both indoor and outdoor environments and the majority focus on measuring five common forms of air pollution: ozone, particulate matter, carbon monoxide, sulfur dioxide, and nitrogen dioxide. Some measure less common pollutants such as radon gas and formaldehyde.