I cook food in a small, badly ventilated room with a natural gas stove for 1-3 hours per day. Someone warned about carbon monoxide poisoning. Googling reveals that most modern burners would typically produce 0 to 50ppm with a tendency to a lower bound in that range. How reliable is this data assuming that burner consumes a "regular" natural gas commonly used in the US? Is there actually a concern in using natural gas burners e.g. in a small room? Is there such a concern for gas furnaces most ...