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Ultragiant urban aerosol particles.

Science (New York, N.Y.)

|November 26, 1976

Summary

High concentrations of ultragiant aerosol particles were found near St. Louis, Missouri. These particles, larger than 5 micrometers, were detected both upwind and downwind of the urban area.

Area of Science:

Atmospheric science
Aerosol science

Background:

Urban areas can influence atmospheric composition.
Aerosol particles play a significant role in air quality and climate.

Purpose of the Study:

To investigate the concentrations of ultragiant aerosol particles.
To determine if urban emissions affect these particles at high altitudes.

Main Methods:

Measurements of aerosol particle concentrations were taken at 300 meters above ground level.
Sampling occurred on 11 different days, both upwind and downwind of St. Louis, Missouri.
Particle size ranged from 5 to 55 micrometers in diameter, with an assumed density of 2.0 g/cm³.

Main Results:

Surprisingly high concentrations of ultragiant aerosol particles were observed.

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Average concentrations were 31 µg/m³ upwind and 55 µg/m³ downwind of the urban area.

A notable increase in particle concentration was detected downwind compared to upwind.

Conclusions:

Urban environments, like St. Louis, can significantly impact the distribution of ultragiant aerosol particles.
These findings suggest that urban emissions contribute to the presence of large aerosol particles at considerable altitudes.