# Measures of pollutant concentration
**Wikidata**: [Q445205](https://www.wikidata.org/wiki/Q445205)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Measures_of_pollutant_concentration)  
**Source**: https://4ort.xyz/entity/measures-of-pollutant-concentration


## References

1. Freebase Data Dumps. 2013