In the Air Act,$\underline {i}$ was amended to include $\underline {ii}$ as an air pollutant.

• A
  $i = 1981, ii = \text{chemicals}$
• B
  $i = 1986, ii = \text{particulate matter}$
• C
  $i = 1987, ii = \text{noise}$
• D
  $i = 1988, ii = \text{chemicals}$