How can an increase in relative humidity affect visibility

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High relative humidity (RH) can significantly impact visibility, particularly when it exceeds 100%, leading to condensation that manifests as fog or rain. This phenomenon reduces visibility and is closely linked to hygroscopicity, which is the ability of particles to absorb moisture. The relationship between visibility, relative humidity, and particulate matter (PM) is influenced by the hygroscopic properties of aerosol constituents. Numerous studies have explored these interactions, highlighting the importance of hygroscopicity in understanding visibility under varying humidity conditions. Research, such as the analysis of extinction properties using a K-EC-Mie model, further investigates how relative humidity affects visibility in specific locations like Nanjing.
Rod Alexei
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Certainly it can in the extreme.
If relative humidity exceeds 100% then you will be getting condensation in the form of fog or rain which will reduce visibility.

It would not surprise me if there is an effect at lower RH, but I don't know for sure.
 
Relationship between Visibility and Relative Humidity, PM in terms of Hygroscopicity
http://adsabs.harvard.edu/abs/2008AGUFM.A11E0177J
Hygroscopicity plays a key role connecting those three variables. And constituent of aerosol is important factor in terms of hygroscopicity. Many experiments have been performed to find features of hygroscopicity with diverse kinds of constituents. Based on those preceding studies, we investigated how dominantly hygroscopicity influences on visibility.


Analysis of extinction properties as a function of relative humidity using a K-EC-Mie model in Nanjing
http://www.atmos-chem-phys-discuss.net/acp-2016-119/acp-2016-119.pdf
 

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