Periodontal treatment is the specialist cleaning of your teeth and gums to help control the bacteria that cause gum disease. Gum disease is caused by the germs (bacteria) which live in your mouth.
Ground-Level Ozone (O 3). Ground-level ozone is a colorless and highly irritating gas that forms just above the earth's surface.It is called a secondary pollutant because it is produced when two primary pollutants react in sunlight and stagnant air.round-Level Ozone (O 3). Ground-level ozone is a colorless and highly irritating gas that forms just above the earth's surface.
Since OH affects the rates at which some pollutants are formed and others are destroyed, changes in OH levels over the long term would have serious implications for air quality. Ground-level ozone (O 3) is a pernicious secondary air pollutant, toxic to both humans and vegetation (Fig. 5). It is formed in surface air (and more generally in the troposphere) by oxidation of VOCs and carbon monoxide in the presence of NO x.