![]() This page summarizes important considerations before starting an investigation. Please add your experiences with PurpleAir too! Suggestions for conducting particulate matter investigations This blog has some dialogue about various use issues.This facebook group includes people who own a PurpleAir and discuss their experiences.PurpleAir maintains a map of every user's data from around the world.This page has some more links of studies to check out if you scroll a bit. A higher R 2 value means better performance. The EPA has an excellent summary of these studies in this table here. That being said, there have been a number of academic studies that have quantified the performance and limitations of some of these optical sensors to help you choose which one to use depending on what you are trying to sense and what level of performance you are looking for. Because of the fact that optical counters rely on these assumptions, the data produced by them are not FRM or FEM certified.The quality of your data will depend on those assumptions as well as environmental considerations such as humidity, light and temperature. The data the PurpleAir (and other optical counters) produce is an estimation of particulate mass concentration that relies on several assumptions for shape, diameter and density.But, the most important things to know when deciding to use an optical particle counter like the PurpleAir is that: This page does a great job of explaining how laser optical particle counters work in detail. Optical sensors provide a way to get near real-time data on the particulate matter in your home or community and to have autonomy over the locations being monitored. In addition, FRM sensors often have a lag of several months for quality control before the data is publicly accessible. However, due to the huge cost upwards of $25,000 associated with Federal Reference Method (FRM) and Federal equivalent method (FEM) sensors, most cities only have a handful of sensors, sometimes just one, measuring each category of pollutant. Why use one?Įvery state in the US is mandated by the Environmental Protection Agency to create air quality sensor networks to monitor the six pollutants that the EPA defines as hazardous - Ground-level ozone, Carbon monoxide, Sulfur oxides, Nitrogen oxides, Lead and Particulate Matter. Perhaps consider visiting to see the start of a barebones kit that is kicking off the development of a well-supported, open source air sensor similar to the PurpleAir. Please contribute any experiences you've had with the PurpleAir. The intention of this page is to create a central location to discuss successful (and unsuccessful) use cases of the PurpleAir and problem solve together. The PurpleAir costs around $200 and provides real time air quality data that can be used to understand indoor or outdoor environments and conduct environmental investigations on air quality. Other similar devices include the Dustduino, Speck, Dylos and more. I am using ArcGIS Online to store the feature layers, but your destination or file format may differĪs we iterate through the sensors, we can check for certain threshold or average values.The PurpleAir is one of many low cost devices that use laser optical particle counters to estimate particulate matter mass concentrations in air for PM2.5 and PM10. ![]() Modify the destination where the data is being written.Before running the script in your environment, there are a few dependencies: I have published the Python Notebook to GitHub for anyone interested in running the service or seeing how the data is being brought in from the PurpleAir API. I have written a sample Python Notebook that is scheduled to run every fifteen minutes which calls PurpleAir's API and loads the data into a hosted feature layer.īy putting it into the hosted feature layer, it becomes accessible in multiple service and file formats, including: PurpleAir has a documented RESTful Application Programming Interface (API) that a user can get programmatic access to sensor data. A topic of conversation in the Organizing and Maps phone calls has been how to utilize data being collected by PurpleAir Real-time Air Quality Monitoring sensors as groups are starting to deploy them as part of their initiatives.
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