Background information 

  - Particulate Matter (link to the info below on this page)
  - Silica (link to silica page.

[Regulations on Monitoring](https://publiclab.org/wiki/pm-monitoring-regulations) wiki includes information on Federal Reference Methods... 

[Collecting Data on Particulate Matter](https://publiclab.org/wiki/pm-monitoring) provides an overview of monitoring options for particulate matter. These are further broken down into three main types of data collection:

  - [Active monitoring](https://publiclab.org/wiki/active-pm),
  - [Optical monitoring](https://publiclab.org/wiki/optical-pm), 
  - [Passive monitoring](https://publiclab.org/wiki/passive-pm). 

Public Lab Tool Development on Passive Monitoring
While the linked pages provide information on the other types of monitoring methods, the most development on this project has been on passive systems. 
The pages below explain the passive monitoring system currently being explored, by the states the monitoring is done in:

  - [Assembling the tool](https://publiclab.org/wiki/passive-pm-assembly)
  - [Deploying the tool](http://publiclab.org/wiki/passive-pm-deployment)
  - [Collecting the samples and creating images of them](https://publiclab.org/wiki/passive-pm-imaging)
  - [Analyzing the images](https://publiclab.org/wiki/passive-pm-analysis)