Dry Deposition is the settling down of pollutants (including particulate pollutants and aerosols) present in the atmosphere onto a ground-level surface. Most often, this deposition is absorbed by the soil or vegetation.
Dry deposition is responsible for the clearance of 50-66% of pollutant particles in the atmosphere.
Figure 4: A graphical representation of the natural process of dry deposition of particulate matter occurring in the atmosphere.
Figure 5: Under the influence of Pure Skies technology transient weak dielectrophoretic forces are created, which accelerates the particulate matter causing them to collide with one another, agglomerate, and clear out from the atmosphere, faster.
Dry deposition happens 24×7, both indoors and outdoors. A common example of dry deposition that we are all familiar with is the layer of dust that settles on the surface of your car if it is not washed for a few days.
Figure 6: An example of dry deposition in action. Dust settles on an unwashed car left outside over a period of several days.
In air pollution control, several technologies utilize the basic principles of agglomeration and settling – two actions that are a key part of dry deposition – to accelerate the clearance of particle pollutants in flue gases emitted from industrial processes. Gravitational settling units (by gravity), electrostatic precipitators (by ionization), and cyclone dust collectors (by centrifugal force) are common examples in everyday use.
Based on laboratory data, the pulsed radio wave technology creates a weak electric field that affects particle pollutants of very small size (lab tested up to 20 microns in diameter), resulting in the formation of temporary dipoles.
Unpublished data from our lab suggests that the reduction in ambient pollutants occurs through the agglomeration and settling of these particle pollutants, with a maximum size of 20-microns in diameter. This is supported by our observation that particle pollutants of 100 microns in diameter are unaffected by pulsed radio wave technology,
Active research to validate this is currently being pursued through research collaborations with academia.
We are pleased to report that we have submitted 2 scientific manuscripts to international peer-reviewed journals for publication. Details from this work will be shared after the manuscripts have been officially accepted and are formally in press.
PM10, PM2.5, and PM1 are well-controlled. In fact, PM1 and PM2.5 are reduced more than PM10 due to their smaller size.
Pulsed radio waves have little effect on particles larger than 20 microns in diameter. These particles are simply too large for our technology. Visible dust, pollen, coke dust, and volcanic dust larger than 20-30 microns are not affected due to their large size.
Size of particulate pollutants affected by Pure Skies. In general, particle sizes smaller than 20-30 microns are affected. There is insufficient data on viruses (e.g. coronavirus) to make any recommendations.
Ozone, VOCs such s NOX & SOX and certain complex pollutants (e.g. polyaromatic hydrocarbons) are not affected by pulsed radio waves.
There is no data on Pure Skies and coronavirus.
All commercial Pure Skies units work in the ISM frequency band similar to the Wi-Fi spectrum (2.4-2.5 GHz) and power levels are maintained under standard regulations. The World Health Organization has stated that there are no adverse health effects from Wi-Fi.
Each Pure Skies unit uses a custom-made omnidirectional antenna (EIRP < 100 mW) which has been tested at multiple facilities, including ITI Labs, Bengaluru (a national level testing facility), Indian Institute of Technology Madras, and other institutions.
Other accessories include an IoT hardware system and Power Source.
