An example can be made with particulate matter , which is composed to solid particle and liquid emissions. There is solid evidence that links particulate matter with respiratory disease and early death among older people. It is in particular the small particulate matter that is most dangerous. The primary concern is to guarantee safety for those whose health is effected by the particulate matter. The secondary concern, or social problem, is the reduction of regional haze.
Ozone is the primary component of smog.
Until recently, its levels were last revised in 1989. Long term exposure leads to lung tissue deterioration, especially in asthmatic children as it brings on the asthmatic conditions. There were also social effects in the form of damaged buildings and reduced forest growth. Further collateral costs included vision impairment and increased medical costs. Upon reviewing the situation, the EPA set new Ozone standards.