Vog is the volcanic haze that is carried downwind from the two erupting sites in Volcano National Park. Right now both sites are releasing some emissions, but it can change daily so it is best to consult with the experts at Volcano National Park. Since the trade winds are flowing from east to west most of the time, the vog is flowing toward Kau District and away from the Puna District. Even South Kona and Captain Cook can be covered with vog when the emissions are heavier. A few days out of the winter months, the wind will flow from the northwest and Puna could have a few days of vog.
I am Hawaii island resident for 28 years with many visits to Volcano National Park and surroundings! I am living in the Keaau area which is in the Puna District.