When too many electrically charged dust particles are inhaled, it is thought that certain vasoactive chemicals are released, thus triggering a headache. These particles also may provoke the migraine headaches associated with certain winds and storms or with crowding in a stuffy room. A change in barometric pressure can trigger a migraine headache. The reduction of oxygen causes the blood and blood vessels to compensate. The scalp arteries swell, as they are extremely sensitive to the pressure of oxygen in the blood, especially to sudden changes, such as those that occur with flying in an airplane or sea diving.
People living or traveling at high elevations can experience similar headaches.
Any change in a migraineur's environment that involves adjustment and adaptation can provoke a headache. Changing schools or jobs requires a great deal of adaptation, resulting in difficulty for the migraine sufferer. Travel may provoke migraine headaches because of the change in routine or diet as well as the new environmental and atmospheric conditions. Many migraineurs are sensitive to travel and seasickness. The jarring motion of a car, train, or boat can trigger a headache.