発はっ生せい源げん

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Meanings

Refers to the point or place where something originates, such as a fire, pollution, sound, or problem.

〈事こと〉の発はっ生せい源げんthe source of (an occurrence, e.g. pollution, noise, disease)
この工こう場じょうが大たい気き汚お染せんの発はっ生せい源げんだと分わかった。
It turned out that this factory was the source of the air pollution.
発はっ生せい源げんを突つき止とめるto track down the source (of an occurrence)
調ちょう査さ員いんたちは異い臭しゅうの発はっ生せい源げんを突つき止とめた。
The investigators tracked down the source of the strange smell.
発はっ生せい源げんを特とく定ていするto identify the source (of an occurrence)
感かん染せん症しょうの発はっ生せい源げんを特とく定ていするのは難むずかしい。
It is difficult to identify the source of an infectious disease.
発はっ生せい源げんとなるto become/serve as the source (of something)
古ふるい配はい管かんが水みず漏もれの発はっ生せい源げんとなっていた。
The old pipes turned out to be the source of the water leak.

原げん因いんN4
原因 is the general word for 'cause' or 'reason', while 発生源 specifically points to the physical or locational origin of something like pollution or noise.
源みなもとN1
源 is a broad, often metaphorical term for 'source' or 'origin', whereas 発生源 is a technical term for the concrete point where something like a pollutant or sound originates.
出でどころ
出どころ is a casual, everyday word for where something (like a rumor or item) comes from, while 発生源 is a more technical term used for pollutants, diseases, or noise.
温おん床しょう
発生源 is a neutral, technical term for the point where a problem originates, whereas 温床 carries the metaphor of an environment nurturing that problem.

発はっ生せいN2
発生 means 'occurrence' or 'outbreak' itself, while 発生源 refers to the specific place or point from which that occurrence originates.

Compound of 発生 (はっせい, 'occurrence') and 源 (げん, 'source'). The reading is standard on'yomi.