I don't know if any international standards for this. If there are, I would like to know. In the U.S., OSHA regulates most of this in part 1910. Noise is in 1910.95.
Hazardous chemical exposure is regulated for specific chemicals in Subpart Z of 1910.
NIOSH (see
I don't know of any international standards, but must assume, humans being pretty much the same all over the world, that similar conditions must apply globally. Go to the USEPA website and look up ambient air quality standards and you will find what you are looking for.
Emission standards and air quality standards (NAAQS) are in current use in the USA (40CFR60) and other industrial countries. Emission taxation and controls, as well as the cost-benefit philosophy of applying such, are a matter being studied by all countries and partly applied by some.
As for noise regulations, many states and cities have their own, so do airports. For noise at work, norms are not new, for example,