(defendant did not act arbitrarily and capriciously under Clean Air Act in setting one-hour concentration of sulfur dioxide at no more than 100 parts per billion even though such standard based on unpublished, nonpeer-reviewed study and where defendant ignored published, peer-reviewed study suggesting that lower standard would pose no harm to human health; decision whether to utilize only peer-reviewed studies at discretion of defendant and defendant explained that study submitted too late in rulemaking process to be evaluated; challenge to rulemaking procedure not within court's jurisdiction and is dismissed).