At what level of carbon monoxide exposure can headaches begin to occur?

Headaches can begin to occur at carbon monoxide exposure levels in the range of 200-400 parts per million (ppm). At this concentration, carbon monoxide affects oxygen delivery to the tissues and can induce symptoms such as headaches, dizziness, and general malaise. The reason this range is significant is that it highlights the potential health effects even at relatively low exposures, emphasizing the importance of monitoring air quality and preventing exposure to carbon monoxide in enclosed or poorly ventilated spaces.

The levels above or below this range may not elicit headaches as early, with significant symptoms typically arising at higher concentrations. For example, levels above 400 ppm can lead to more acute and severe symptoms, including confusion and even loss of consciousness, but these symptoms would typically be preceded by the onset of headaches at the lower levels. Understanding the specific concentrations and associated health effects is crucial for effectively managing risks associated with carbon monoxide exposure.