---
title: "Sensor guides | Aethair"
description: "Buying guides and measurement-method comparisons for environmental monitoring: choosing a particulate matter monitor, optical vs gravimetric PM, NDIR vs…"
url: https://aethair.io/guides/
---

[Aethair Article Library](https://aethair.io/resources/)

# Sensor guides

How the sensors work and how to choose one: the measurement methods behind the numbers, compared, and a buying guide.

- [All 27](https://aethair.io/resources/)
- [Monitoring Guides 11](https://aethair.io/resources/#monitoring-guides)
- [Regulations 5](https://aethair.io/resources/#regulations)
- [Aethair Products 3](https://aethair.io/resources/#aethair-products)
- [Environmental Data 3](https://aethair.io/resources/#environmental-data)
- [EHS Compliance 2](https://aethair.io/resources/#ehs-compliance)
- [Healthcare 2](https://aethair.io/resources/#healthcare)
- [Environmental Intelligence 1](https://aethair.io/resources/#environmental-intelligence)
- [Sensor guides 3](https://aethair.io/guides/)

## Guides

- [Sensor guide](https://aethair.io/guides/choosing-a-pm-monitor/)
  ### [Choosing a particulate matter monitor](https://aethair.io/guides/choosing-a-pm-monitor/)
  [Choosing a particulate matter monitor comes down to a series of smaller decisions: what you are measuring for, how accurate the number needs to be, where it will live, and how many you…](https://aethair.io/guides/choosing-a-pm-monitor/)

  [3 min read](https://aethair.io/guides/choosing-a-pm-monitor/)
- [Sensor guide](https://aethair.io/guides/ndir-vs-electrochemical-co/)
  ### [NDIR vs electrochemical CO measurement](https://aethair.io/guides/ndir-vs-electrochemical-co/)
  [Carbon monoxide is measured by two very different sensing principles, and the right one depends entirely on what you are measuring and why.](https://aethair.io/guides/ndir-vs-electrochemical-co/)

  [3 min read](https://aethair.io/guides/ndir-vs-electrochemical-co/)
- [Sensor guide](https://aethair.io/guides/optical-vs-gravimetric-pm/)
  ### [Optical vs gravimetric PM measurement](https://aethair.io/guides/optical-vs-gravimetric-pm/)
  [Optical and gravimetric methods answer the same question (how much particulate matter is in the air), but they arrive at the number in fundamentally different ways.](https://aethair.io/guides/optical-vs-gravimetric-pm/)

  [3 min read](https://aethair.io/guides/optical-vs-gravimetric-pm/)