Vog over South Oahu should decrease over the next 24 hours as wind that brought the volcanic haze dies down, a University of Hawaii professor of meteorology said Tuesday.

A high-pressure cell produced southeasterly winds that carried the plume of vog to Oahu, said Steven Businger, a UH professor and principal investigator of the school’s Vog Measurement and Prediction Project. The project can be viewed online at weather.hawaii.edu/vmap.

Oahu’s current air quality is "moderate," according to project measurements. That means acceptable air quality, but some pollutants could cause moderate health problems for a very small number of people. Those who are usually sensitive to ozone might have respiratory problems, according to airnow.com, an air quality website.

As of 2 p.m. Tuesday, urban Honolulu’s air quality was rated at 70 in the moderate range that runs from 51 to 100, according to airnow.com. Kapolei was rated at 73, Sand Island at 73 and Kihei, Maui, at 59.

Janet Babb, spokeswoman for the Hawaiian Volcano Observatory, said scientists haven’t been able to measure sulfur dioxide emissions from Kilauea since Dec. 29 because of the lack of tradewinds. Without the tradewinds, the gas disperses and scientists can’t get good samples, she said.