Dive summary:

• Methane and carbon dioxide have been detected in two schools in Pleasantville, N.J., that were build on top of a landfill.
• While officials say there is no immediate threat, a pipeline will have to be built to divert the gas from the schools.
• The school district has until May 2017 to install a new ventilation system, but Board Secretary Dennis Mulvihill said they hope to begin construction next summer.

From the article:  

Methane and carbon monoxide have been detected in soil underneath two Pleasantville schools built atop a landfill, but there is no immediate threat to students and faculty, Superintendent Garnell Bailey said.
There were no gases detected within the school buildings, Paul Kenny, a licensed site remediation professional who works with Remington & Vernick Engineers assigned to the Pleasantville School District said in an email Tuesday. ...