Isolated thunderstorms are in the forecast for Sunday, followed by increasing heat and humidity Monday and Tuesday, according to the National Weather Service. Additionally, the state has issued an air quality advisory for Sunday until midnight for Long Island, as well as New York City and all the way through the upper Hudson Valley.

The air quality index (AQI) is predicted to be above 100 in much of New York state on Saturday, and could reach 135. Alerts are also in place for parts of New England. The AQI measures the severity of pollution in the air and categorises health risks. The higher the number, the more unsafe the air is to breathe.

According to the BBC, State officials revealed that the air quality index is expected to top 100, with some areas pushing 135. Numbers like that mean the air can irritate lungs and trigger asthma or heart problems. Parts of New England are also dealing with the same conditions.