O&G ( Oil and Gas) companies release hydro-carbon or unwanted gases, could be byproduct of some processes too into the atmosphere. But regulations require these gases to be burnt before it reaches the atmosphere to prevent it from polluting the atmosphere as well as prevent accidental explosion of unburnt hydro-carbon.

Any O&G companies would install at least one Flare where they would have pilot flame which will ignite any unburnt/unwanted/byproduct gases before it is released into the atmosphere. It is very important to monitor the pilot flame as well as any gases are burnt properly before it reaches air.
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