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Syrian children, first aiders and civil defence volunteers showing their support of victims in the recent alleged chemical attack in Syria. Mohammed Badra/EPL

What we know about the April 4 chemical attack in Syria

The Organisation for the Prohibition of Chemical Weapons Fact Finding Team has not yet revealed the nature of the chemicals used in Khan Sheikhoun.
Debate over potential pollutants calls for better tools to measure air quality. Singapore Spotter/flickr

Explainer: is aircraft cabin air toxic?

Health effects from contamination on planes is controversial, not least because we don't measure on-board air quality during 'fume events'.

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