Quickly closed my balcony window!! ㅠㅜ

I think the apartment above? or below? has a gas leak...ㅜ The smell is really strong even in my place..... I checked my own place too, thankfully it was okay...ㅠ As soon as I smelled it, I closed the balcony window and put on my LG94 mask, and I'm folding laundry & underwear right now!! ㅅㅎ