Ozone Module Siting Guide
Ozone behaves differently from other pollutants, so where you place the Ozone Module matters for the data you get. This guide covers the key considerations and distance guidance. For general device siting, also see the Node-S siting guide.
Ozone-specific considerations
Placement should follow your project goals, but keep these ozone behaviors in mind:
- Ozone is titrated by NOx. Near a source of NOx, the measured concentration will read lower than in nearby areas farther from that source.
- Ozone is scrubbed by vegetation like trees and bushes, so keep adequate distance between vegetation and the monitor.
The US EPA has detailed ozone siting guidelines in Section 7 of the Quality Assurance Handbook for Air Pollution Measurement Systems and in Appendix E to Part 58 of the US Code of Federal Regulations.
Distance from roadways
Choose your minimum distance from a road based on its traffic volume:
| Vehicles per day | Minimum distance (m) |
|---|---|
| 1,000 | 10 |
| 10,000 | 20 |
| 15,000 | 30 |
| 20,000 | 40 |
| 40,000 | 60 |
| 70,000 | 100 |
| 120,000 | 250 |
Other distance guidance
- The distance from the monitoring path to an obstacle (like a building) must be at least twice the height the obstacle protrudes above the monitor.
- The monitor should have unrestricted airflow 270° around the probe or sampler — 180° if the probe is on the side of a building.
| Measurement | Distance (m) |
|---|---|
| Height above ground | 2–15 |
| Horizontal and vertical distance from supporting structures | >1 |
| Distance from trees | >10 |
| Distance from a tree's drip line (outer circumference of the branches) | >20 |
What's next
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