Researchers studying China found light pollution may have varied as a result of lock downs during the COVID-19 outbreak. 
- When measured using Nighttime Light (NTL) radiance, researchers found light pollution generally increased in residential areas, decreased in commercial areas, and stayed roughly the same in transportation and public facility areas. On average, light pollution across the country decreased when compared to values from previous years.
- Researchers note that average light pollution values increased again following the end of COVID-19 lock downs.  

Kenyon College

Light pollution occurs when human activity results in an excessive amount of outdoors artificial light. Ideally: 
- Light pollution should be low enough that various star constellations are visible to the naked eye 
- Light pollution should register low on any number of meters available to calculate light pollution
- Light pollution should not be high enough to disrupt the local ecosystem or cause adverse effects on human health 

Light Pollution (Post-COVID-19)

Liu, Q., Sha, D., Liu, W., Houser, P., Zhang L., Hou, R., Lan, H., Flynn, C., Lu, M., Hu, T., & Yang, C. (2020). Spatiotemporal Patterns of COVID-19 Impact on Human Activities and Environment in Mainland China Using Nighttime Light and Air Quality Data. Remote Sensing, 12(10), 1576. https://doi.org/10.3390/rs12101576 

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