All scholarly content published within the “Pollution and Diseases” publishing ecosystem is assigned a Digital Object Identifier (DOI) through Crossref under the prefix: 10.66659
This DOI policy ensures consistency, transparency, and long-term persistence of identifiers across all publication platforms, including the journal, repository, book publications, and conference outputs.
1. DOI Structure
Each DOI is constructed using a standardized suffix format:
10.66659/pd.[content-type].[year].[sequential-number]
Where:
• pd – identifies the publishing ecosystem
• content-type – distinguishes the category of content
• year – the year of publication
• sequential-number – a unique number assigned in chronological order
This structure is designed to be stable, scalable, and independent of internal editorial classifications.
2. Content Categories
DOIs are assigned according to the following content categories:
• Journal content
10.66659/pd.2026.001
(applies to all article types, including research articles, reviews, editorials, and discussion papers)
• Repository content
10.66659/pd.rep.2026.001
• Books and book chapters
10.66659/pd.book.2026.001
• Conference materials
10.66659/pd.conf.2026.001
(including presentations, posters, and other contributions) 
3. DOI Assignment Principles
• DOIs are assigned upon acceptance or publication of content.
• Sequential numbering is maintained independently within each content category.
• Each DOI is unique, persistent, and will never be reassigned.
• The DOI itself does not encode detailed bibliographic metadata. All descriptive information (e.g., article type, authorship, title) is maintained in the metadata registered with Crossref. 
4. Metadata and Maintenance
All DOIs are registered with complete and accurate metadata via Crossref. The publisher commits to:
• maintaining up-to-date metadata,
• ensuring that all DOI links resolve to active landing pages,
• supporting reference linking by including DOIs in citations where available. 
5. Scope and Consistency
This DOI policy applies uniformly across all platforms operated within the publishing ecosystem. The use of a single DOI prefix and consistent suffix structure ensures:
• interoperability across systems,
• compatibility with indexing and abstracting services (including Scopus and Web of Science),
• and long-term integrity of the scholarly record.