New insights into submicron particles impact on visibility

Area of Science:

• Environmental Science
• Atmospheric Chemistry
• Air Quality Monitoring

Background:

• Submicron particulate matter (PM1) has distinct properties and origins compared to PM10.
• Growing environmental awareness necessitates understanding PM1's impact on visibility.
• Urban air quality research is crucial for public health and environmental policy.

Purpose of the Study:

• To analyze the impact of PM1 on visibility deterioration in urban areas.
• To determine the chemical composition of PM1 and its relationship with visibility.
• To investigate the influence of meteorological parameters on PM1 and visibility.

Main Methods:

• Chemical composition analysis of PM1 in two Polish urban locations.
• Concurrent measurement of meteorological parameters and visibility.
• Statistical analysis including hierarchical cluster analysis, correlation matrices, heat maps, and classification and regression trees.

Main Results:

• The light extinction coefficient is primarily influenced by coarse PM mass, PM1-bound ammonium nitrate, organic matter, and Rayleigh scattering.
• PM1-bound ammonium sulfate, elemental carbon, and soil have a lesser impact on light extinction.
• Secondary origin PM1 components significantly influence visibility, with PM1 and humidity playing key roles.

Conclusions:

• Secondary PM1 components are the most significant factors affecting visibility.
• Statistical agglomeration techniques can effectively identify visibility variation ranges.
• Understanding PM1's chemical composition is vital for predicting and mitigating visibility impairment.