Which types of chemical products risks to health and the environment?

The following classes of chemical products unacceptable risks to human health or the environment.
• While many chemical products degrade rapidly in the environment, some are released in large concentrations or under conditions that increase concentrations in environmental media, causing adverse effects on humans and/or wildlife.
• Certain chemical products combine physical and chemical properties so that after release into the environment they degrade very slowly, remaining in environmental media and organisms for years or even decades, even when released in small quantities: such Chemicals are called persistent chemicals. These chemical products can be distributed over long distances through natural environmental processes, causing harm to environmental media, food, wildlife and humans.
Regional and global pollution.
• Certain environmental pollutants from water and food retain higher concentrations in wildlife and/or humans than in food and water: this chemical is called bioaccumulation and when would have an adverse effect.
• When predatory organisms higher up the food chain eat contaminated wildlife, they can get very high body levels of certain chemical products: an effect called biomagnification, which can have serious adverse effects, including birth defects and reproductive failure .
• In recent decades, greater attention has been given to addressing the risks posed by persistent, bioaccumulative and toxic substances, as widespread hazards can occur over longer periods of time (affecting generations) with toxic effects. Such chemicals include persistent organic pollutants and certain metal compounds.
• Some chemical products may have direct adverse effects on wildlife or humans, and other chemical products may alter the environment in such a way as to pose a danger to humans or wildlife. Examples of this include volatile organic chemicals and nitrogen oxides, which cause tropospheric ozone (or "smog") and chlorination
carbon, causing the destruction of the stratospheric ozone layer, thereby increasing the ultraviolet radiation on the earth's surface.
• For some environmental pollutants, science has failed to demonstrate “no effect” levels for humans (eg particulate sulfate in the air, blood lead levels in children).
What can be done to address the risks posed by hazardous and toxic chemical products?
Appropriate use of chemical products is essential for establishing and maintaining a high standard of living in a country at any stage of development. However, failure to properly assess and manage the risks posed by the use of chemical products and the possible release of chemicals to the environment can seriously affect sustainable development activities at the national, regional and global levels.
Governments are now placing greater emphasis on the need for risk management actions to protect their people and the environment from the threats posed by toxic chemical products. Risk management actions include developing measures to prevent or control the release of problematic chemicals at appropriate stages of their life cycle, including research, development, production, transport, use and waste disposal. In addition to action at the national level, a number of international agreements and programs have been implemented to address the risks posed by chemicals of international concern because of their regional or global impact on health and the Necessity for health and environmental impacts.