Air temperature is the measure of how cold or hot the air is. It is also known as surface temperature in meteorology.

Humidity is the amount of water vapour that is present in the air at any given point of time. It can be both in a relative or an absolute measure.

When the air is cooled to the point of saturation of water vapour, that point is known as the dew point. A Hygrometer is used to measure the dew point over wide ranges of temperatures.

Carbon Dioxide is a colourless and odourless gas which is 50% denser than dry air. It is considered both a greenhouse gas as well as a gas which is needed for industrial uses

Air pressure, atmospheric pressure, or barometric pressure, is the pressure exerted over a surface by the weight of an air mass (and its molecules) above it.

Carbon Monoxide is an odourless, colourless and tasteless gas which is slightly denser than air. It is toxic to humans and certain animals, when being exposed to it in certain concentrations.

When one is exposed to unwanted noises on a regular basis, or when a place records unwanted noises on a continuous basis, that results in noise pollution.

Nitrogen Dioxide(NO2) is a gas that forms when nitrogen oxides react with air. It is an intermediate in the industrial synthesis of nitric acid, of which millions of tons are produced every year. NO2 is reddish brown in colour with a pungent, sharp and biting odour.

It is a naturally occurring hydrocarbon which is used to produce electricity, for cooking besides some industrial uses. It is a colourless and odourless fossil fuel.

Ammonia is a compound of Nitrogen and Hydrogen. It is a colourless gas which has many industrial and domestic uses. If inhaled in large quantities, it can be harmful for humans.

These are particles which are microscopic solid or liquid particles which are suspended in the atmosphere.

PM 10 are particulate matter smaller than 10 microns. Theoretically, PM2.5 particles also come under this group, but we will consider Particulate matter as a whole when we discuss PM 10. However, gas based pollutants are not considered in the PM10 category.

PM1.0 are particulate matter smaller than 10 microns. Theoretically, PM1.0 particles also come under this group, but we will consider Particulate matter as a whole when we discuss PM1.0. However, gas based pollutants are not considered in the PM1.0 category.

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Ozone is a strong oxidant, and it can react with a wide range of cellular components and biological materials. Ozone can aggravate bronchitis, heart disease, emphysema, asthma and reduce lung capacity.

Sulfur dioxide is a gas. It is invisible and has a nasty, sharp smell. It reacts easily with other substances to form harmful compounds, such as sulfuric acid, sulfurous acid and sulfate particles