Which of the following must LPG and CNG containers be kept away from?

LPG (liquefied petroleum gas) and CNG (compressed natural gas) containers must be kept away from sources of ignition because both types of gases are highly flammable. If exposed to any kind of ignition source, such as flames, sparks, or heat, they can ignite and potentially lead to explosions or fires, posing significant safety hazards.

Proper storage practices dictate that these gas containers should be placed in areas where there is no risk of contact with anything that could cause ignition. This is crucial in preventing accidents and ensuring safe handling and use of these fuels.

While humidity, direct sunlight, and public transport could pose other concerns for the integrity of the containers or handling procedures, the immediate danger related to LPG and CNG is primarily associated with ignition sources.