Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of boiler manufacturer Babcock & Wilcox (NYSE: BWC) rose more than 10% in early trading after the Environmental Protection Agency said it would propose a rule for reducing mercury, lead, and soot in boilers and incinerators.

So what: The EPA and green groups are positioning the rule as a cost-saving measure, claiming it could reduce health-care costs related to harmful emissions. Babcock & Wilcox could benefit as a manufacturer of cleaner boilers, Bloomberg reported.

Now what: If that seems a stretch, you're not alone in thinking that. Babcock & Wilcox's early surge moderated to a mere 1% gain on a day when the Dow Jones Industrial Average (INDEX: ^DJI) rose more than 4%. Where do you stand? Would you buy shares of Babcock & Wilcox at current prices? Please weigh in using the comments box below.

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