The most important is the concentration; any chemical can be dangerous if a specified limit is exceeded.
You can say technology is beneficial when it does something good. You can say technology is harmful when it does something bad.
The opposite of harmful would be helpful. You could also say beneficial or fortunate.
The chemicals used may be harmful to breath in.
Styrofoam can do many things to the enviroment. For one thing, it doesn't decompose until over 100 years! Also, it has many harmful chemicals that could seep into the ground.Actually, styrofoam contains one chemical: polystyrene, which is long chains of the styrene monomer. It doesn't 'seep into the ground' at all. However that is not to say it doesn't damage the environment. Obviously it is not good to leave polystyrene lying around but it does no more harm than a plastic bottle or coke can - an eyesore maybe, but it won't leak chemicals or poison anything.
The white lab coat is often seen as a standard uniform for a scientist. However, it has many practical uses in a laboratory, such as protecting clothing and skin from stains and dangerous chemicals and preventing contamination.
you can go to a pet store and buy a betta water treatment for fish. read the back and it should say that it removes the harmful chemicals for the fish from the tap water. If you have any questions, ask an employee. They will help you.
Tobacco in any form is harmful to health.
oragnic food does a very good role to a person specially those that has some problems in their health. organic food has natural supplement that is needed by our body. they reflenish our body and makes it more stronger and helps fights the common sickness and also nourishess us with the vitamins and nutrients they have like the fruits vegetable and meat.
Most computer hardware contains harmful chemicals. As an example, you cannot throw monitors away because the lamps (lights) contain the dangerous chemical Mercury. Most technology and computers contain Mercury, so they cannot be thrown away. It is also against the law (depending on which state), if you read the back of the device carefully, it will most likely say "Dispose according to local, state, and federal law.".
produits chimiques
It depends on your point of view: The truth, I suspect, was that it's a bit of both. But then it's easy for me to say the British were not the worst Imperial masters in history: I've never had a foreigh soldier telling me what to do in my own country !
they all say that it is wrong to treat the environment in a bad way