Spare the Air Alert in place for Wednesday as temperatures head up

Temperatures in many Bay Area places are expected to reach at least 100 degrees Wednesday.

A reboot of the Bay Area’s recent heat on Wednesday will bring with it a Spare the Air Alert.

The Bay Area Air Quality Management District issued the fifth alert of the year on Tuesday. The agency said conditions that will cause rising temperatures Wednesday would also likely keep ground-level ozone measurements at unhealthy levels.

According to the district, areas of the far East Bay interior likely will have air quality that is unhealthy for the elderly and very young, and those with heart, respiratory or other health conditions. The South Bay and North Bay are expected to have air that is moderately healthy.

The smog Wednesday will result from the final remnants of a high-pressure system that has smothered California for the last week and will bring back the heat and form a low ceiling on the top of the atmosphere, forecasters said.

Temperatures in the hottest places in the East Bay and high elevations are expected to be between 102 and 106 in the East Bay on Wednesday and between 105 and 110 on Thursday, according to the National Weather Service.

In the South Bay, temperatures are forecast to run between 91 and 98 on both days.

The district issued two alerts during the initial part of a heat wave that charred the region just before the Fourth of July.