Legal Regulations
In general, there are two types of air quality standards. The first class of standards (such as the U.S. National Ambient Air Quality Standards and E.U. Air Quality Directive) set maximum atmospheric concentrations for specific pollutants. Environmental agencies enact regulations which are intended to result in attainment of these target levels. The second class (such as the North American Air Quality Index) take the form of a scale with various thresholds, which is used to communicate to the public the relative risk of outdoor activity. The scale may or may not distinguish between different pollutants.
Read more about this topic: Air Pollution
Famous quotes containing the words legal and/or regulations:
“In ‘70 he married again, and I having, voluntarily, assumed the legal guilt of breaking my marriage contract, do cheerfully accept the legal penalty—a life of celibacy—bringing no charge against him who was my husband, save that he was not much better than the average man.”
—Jane Grey Swisshelm (1815–1884)
“If the veil were withdrawn from the sanctuary of domestic life, and man could look upon the fear, the loathing, the detestations which his tyranny and reckless gratification of self has caused to take the place of confiding love, which placed a woman in his power, he would shudder at the hideous wrong of the present regulations of the domestic abode.”
—Lydia Jane Pierson, U.S. women’s rights activist and corresponding editor of The Woman’s Advocate. The Woman’s Advocate, represented in The Lily, pp. 117-8 (1855-1858 or 1860)