# Pollutant Standards Index

> Index to describe air quality

**Wikidata**: [Q708545](https://www.wikidata.org/wiki/Q708545)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Pollutant_Standards_Index)  
**Source**: https://4ort.xyz/entity/pollutant-standards-index


## References

1. Freebase Data Dumps. 2013