Parking restrictions for nyc fire hydrants?
Are your smoke detectors capable of detecting carbon monoxide, carbon monoxide is colorless odorless and very dangerous. Carbon Monoxide is produced by factories and vehicles maybe if your smoke detectors can detect CM thats what it detected cause you said you opened the windows. My smoke detectors can detect Carbon Monoxide leaks but I don't know if yours do. Other than that it might be the batteries are going out but it's highly unlikely all of them would go out the same time, I can't think of any other possibility. Good Luck, Peace.
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