Ultimately, the goal of standard-setting should be the development of composite pollution indices rather than control of individual pollutants.
More recent studies conducted in the United States have also reported associations between ambient air pollution and sperm quality, but for individual pollutants [i.e., O3 and PM2.5 (particulate matter ≤ 2.5 μm in aerodynamic diameter)].
Pollutants should be considered together in the risk assessment of air pollution, as opposed to measuring the risk of individual pollutants.
Research into the effects of air pollution on human and animal health has focused on the impact of individual pollutants on respiratory function in the laboratory.
This is only the first of several political tests to come this fall, as she also seeks to tighten rules governing individual pollutants like mercury and global warming gases like carbon dioxide.
A 1999 Park Service study of air quality at the west entrance to Yellowstone found that "levels of individual pollutants, including carcinogens such as benzene, that results from the snowmobile exhaust can be high enough to be a threat to human health".
What's more, the contamination levels found in the new study were well below the tolerance levels for some individual pollutants set by the Food and Drug Administration and must be viewed against the background of a huge drop in recent decades in the amount of PCB's, dioxins and similar chemicals found in the food supply.
Each of the individual pollutants has varying impacts.
The weightage of individual pollutants can be found out using analytical hierarchy process (AHP).
Typical results indicated that the simultaneous removal of As III) and Cr VI) is beneficial over the removal of individual pollutants.
The results showed that acetaminophen, atenolol and lincomycin were the main individual pollutants usually found in concentrations over 10 μg/L in the sewage influent.
