Medical teams planned for the births for months, even designating a special "Code 5" designation, handing out pagers to staff and developing a color-coded system to match each baby with his or her needed supplies.

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"The Color-coded Threat Level System is used to communicate with public safety officials and the public at-large through a threat-based, color-coded system so that protective measures can be implemented to reduce the likelihood or impact of an attack, " according to the DHS Web site.

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Authorities have also introduced a color-coded warning system to alert residents about dengue outbreaks in specific districts.

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He thinks that's one reason people have had so much trouble with the agency's color-coded alert system.

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New York has been on "orange" alert, or the second-highest level -- indicating a high risk of terror attack -- since the color-coded warning system was established after the September 11, 2001 attacks.

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"Orange" is the second-highest level in the nation's five-tiered, color-coded threat alert system.

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Its report grades cities using, in part, the EPA's color-coded Air Quality Index, as well as its own weighting system that ranks the severity of pollution on a daily basis.

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