Author: shiromani Subject: not convinced by OA Posted: Sun Jan 31, 2010 12:37 am (GMT -8) In 1986, the city of Los Diablos had 20 days on which air pollution reached unhealthful amounts and a smog alert was put into effect. In early 1987, new air pollution control measures were enacted, but the city had smog alerts on 31 days that year and on 39 days the following year.

The rest is here: 
Critical Reasoning :: not convinced by OA