File:Osaka Municipal Subway 10 series EMU 021.JPG|Rooftop [[Condenser (heat transfer)|condenser]] unit fitted on top of an [[Osaka Municipal Subway 10 series]] [[Rapid transit|subway]] carriage. Air conditioning has become increasingly prevalent on [[public transport]] vehicles as a form of [[climate control]], and to ensure passenger comfort and drivers' [[occupational safety and health]]. | File:Osaka Municipal Subway 10 series EMU 021.JPG|Rooftop [[Condenser (heat transfer)|condenser]] unit fitted on top of an [[Osaka Municipal Subway 10 series]] [[Rapid transit|subway]] carriage. Air conditioning has become increasingly prevalent on [[public transport]] vehicles as a form of [[climate control]], and to ensure passenger comfort and drivers' [[occupational safety and health]]. |