In Chennai, there is over 50% increase in PM2.5 concentration during the days when aerosols are transported from north India. The regional transport of aerosols from north India occurs for two to four days at a stretch twice or thrice a month during the period December to March
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Aerosol coming from outside was not adding to the pollution already seen in the cities that are referred to as urban aerosol clean islands. Instead, these cities in northwest and in the northern Indo-Gangetic Plain region were stopping or diverting the incoming aerosol and moving it around the city
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While black carbon has a large effect on snow darkening and resultant melting of snow, dust particles transported from as far as Saudi Arabia that gets deposited in the Western Himalayan Region has a large role to play in melting of snow, particularly at higher elevations.
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Based on experiments and simulations, researchers have found that air emitted during plosive speech sounds — where a consonant (P, B, T, D, K and G) is produced by stopping the airflow using the lips, tongue tip or body followed by a sudden release of air — lead to significantly enhanced directed transport of the virus. When the speech contains a train of such puffs a continuous, turbulent, jet-like flow is formed and is capable of transporting air and droplets to over two metres in just 30 seconds.
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