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ST. LOUIS (KSDK) – The heat picks up Tuesday, and it brings a 2014 milestone.

With temperatures reaching into the mid-90s, the first orange air quality for 2014 has been issued for the day.

The air quality index measures the amount of pollution in the air.

RELATED: Check St. Louis air quality rating

RELATED: Check Metro East air quality rating

The orange label means air means members of sensitive groups – such as people with lung disease or asthma – could be affected, according to the U.S. Environmental Protection Agency. The general public is unlikely to be affected.

Tuesday's heat index should be around 100 this afternoon, and there's a chance for storms Tuesday night and Wednesday, according to NewsChannel 5 meteorologist Scott Connell.

Cooler and drier air is expected Thursday into Friday.

RELATED: Latest forecast

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