# LicheN — Assess nitrogen pollution

> Assess nitrogen pollution (iPhone/iPad app by Centre for Ecology and Hydrology.)

- Source: https://appshunter.io/ios/app/lichen/id6475956555 (this page in markdown: same URL + `.md`)
- Developer: [Centre for Ecology and Hydrology](https://appshunter.io/developer/986306797)
- Category: Education, Reference
- Price: Free
- Age rating: 4+
- Requires: iOS 14.0 · 23 MB
- Languages: American English
- Released: 2025-08-04
- Data updated: 2026-08-13
- User reviews in markdown: https://appshunter.io/ios/app/lichen/id6475956555/reviews.md

## What is LicheN?

Curious about nitrogen pollution in your area?
This app helps you assess local nitrogen air quality using lichens—good indicators of nitrogen pollution levels in the atmosphere. Knowing nitrogen pollution levels can tell us a lot about the health of your local environment. It provides:
•	A simple lichen ID photo guide for nitrogen-sensitive and tolerant species
•	Easy tools for recording lichens on trees and branches
•	A step-by-step field guide for conducting surveys
•	An automatic nitrogen air quality index score (NAQI)
•	Clear pollution zone results: Clean, At Risk, Nitrogen Polluted, or Very Polluted
Use nature to understand your air quality and environment!


## Version history (last 1 release)

### 2.0.0 — 2025-08-04

No release notes.

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All apps by Centre for Ecology and Hydrology: https://appshunter.io/developer/986306797

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-13.*