Measuring Air and Water Quality: The air we breathe and the water we drink are very important parts of our lives, without them we won't survive! If the most important thing gets contaminated, this could harm us all. Just as I explained before, it would toxicate our bodies and other living things too. But we have specail organisms that can detect the problems in our envirenment. Biological indicators are plants or animals that we observe to determine any change in our environment. Learning to watch for clues of potentially harmful environmental conditions through careful observation of animals could prevent health problems in humans. Although we don't notice the affects in ourselves, children and babies may be suffering greater harm due to their smaller size and vulnerability. If we notice problems arising in animal population, or unusual numbers of certain animals (or lack of animals) we can search out the cause to prevent further harm to the environment around us, and ourselves. Macroinvertebrates are organisms that lack a spine and are large enough to be seen with the naked eye. Examples of macroinvertebrates include flatworms, crayfish, snails, clams and insects, such as dragonflies. Many aquatic insects live as juveniles, called nymphsor larvae, in the water, and become flying insects as adults. We use macroivertebrates to any change in water.

Measuring Water Quality: Measuring water quality refers to the physical, chemical and biological characteristics of water. The water quality is measured by the macroinvertabrates and there are 6 things we need to keep in consedration when we measure the water quality. When testing water quality: Ph :we should know the Ph of water so, we know if the water is acidic,netural or basic. Too acidic or too basic is not good for the animals in the water. If it's too acidic or basic, animals will die. Phosphates: the level of phosphate in the water is bad for the animals because it toxicates them Nitrates: the level should not exceed 40mg/l. Too much is not good, because it means that fertilizers were in thrown or dissolved in the water from near agriculture area. Oxygen level: The higher the oxygen level the better the water quality. It means that more animals are living in there. Carbon dioxide level: A high amount of CO2 is not good for the animals. Turbidity:Turbidity refers to the clarity of water, or how clear it is. This determines how much light gets into the water and how deep it goes. Temperature: it impacts the rates of metabolism and growth of aquatic organisms, rate of plants' photosynthesis, solubility of oxygen in river water, and organisms' sensitivity to disease, parasites, and toxic materials. At a higher temperature, plants grow and die faster, leaving behind matter that requires oxygen for decomposition. The higher the tempreture the less healthy the water is. To measure the water quality we use different intruments for different things. We use a pH meter, dissolved oxygen meter, and much more This is the process water goes through to check the different levels of compounds in water!		Measuring Air Quality: As an alternative to or in conjunction with direct monitoring, computer models are often used to predict the levels of pollutants emitted from various types of sources, and how these emissions eventually impact ambient air quality over time. There are 2 ways in which we measure the air quality: continuous monitoring air is constantly measured and the data is automatically transmitted to a central database 2. incontinuous monitoring In noncontinuous monitoring, contaminants collect on a filter or canister over a specified period of time (such as one, three or six days). Then a technician collects the filter or canister and sends it to a certified laboratory for measurement and analysis. When measuring air quality we cosider the amount of carbon monoxide (CO), nitrogen dioxide (NO2), ozone (O3), sulphur dioxide (SO2), hydrogen sulphide (H2S). Te higher the conentration of these compounds the more contaminated the air is! This is the control center for the database!