Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2016 May 9;13(5):478. doi: 10.3390/ijerph13050478

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© 2016 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

PMC Copyright notice

(a). Distribution of nitrogen concentration per catchment area for the 2015 mandate. (b) Distribution of nitrogen concentration per catchment area for the 2022 mandate.

(a). Distribution of nitrogen concentration per catchment area for the 2015 mandate. (b) Distribution of nitrogen concentration per catchment area for the 2022 mandate.