Air pollution is also a problem due to chemical agents from industrial sources.

None of the 600 or so workers here were exposed to chemical agents, he said.

Further, the agency is now conducting its own review of possible exposures to chemical agents during the war.

As a result, experts agree that it is generally hard to use chemical agents outdoors with precision.

National newspapers have since reported that soldiers used chemical agents.

The results of tests for biological or chemical agents should be available on Wednesday, health department officials said.

Inside are three kinds of sensors that can detect biological or chemical agents.

There were also some with injuries related to chemical agents.

The explosive and chemical agent were then incinerated at high temperature.

"It's illegal to discharge chemical agents inside a time terminal, but nothing would surprise me around here, these days."