It was the worst Mother Lode air quality day in recent history. Wednesday, county health officials were saying pollution and ozone levels here would soar to unhealthy levels.
Drift smoke from fires in Oregon and the Sequoia National Forest, combined with hot temperatures and a high-pressure system is keeping the bad air staying right where it is.
Earlier this week the air measured at Sequoia National Park had a higher smog reading than downtown Los Angeles.
Bill Sandman at the Tuolumne County Air Pollution Control District office says smoke being pushed by air currents into the area should start to dissipate starting tomorrow. Lower temperatures should also return.
Public Health officials in Tuolumne and Calaveras counties are asking people with respiratory problems to stay indoors this week.
Tuolumne County Public Health Nurse Kathy Amos says with smoky conditions or bad air, persons with asthma other upper respiratory diseases, and the elderly and small children, should avoid outdoor activity.
If you normally jog or run outside, it´s recommended that you curtail that activity until the air clears.
“If a person is experiencing any kind of respiratory difficulty they should call their physician or 911,” she says.