After a week of cool, clear conditions, Chatham-Kent and region will be under a smog advisory on Saturday.

The Ontario Ministry of the Environment issued the review at around 3:30 p. m. on Friday.

During a smog advisory, people might suffer from eye irritation. Also, heavy outdoor work out may cause respiratory symptoms, for example coughing or shortness of breath.

People who suffer from heart or lung disease as well as asthma might experience deterioration in their condition.

Other regions under the advisory comprise of Elgin, Huron-Perth, London-Middlesex, Sarnia-Lambton, and Windsor-Essex.

Hot and sunny setting in combination with a southwesterly flow of polluted air from the U. S. and a local increase of pollutants is anticipated to result in high smog levels throughout the regions of southwestern Ontario.

A Smog Advisory is connected with the Air Quality Index, which rates how fresh the air is. The AQI scale varies from 0 to 100+. Higher numbers mean advanced health risks.

A Smog Advisory is issued in a particular area when the AQI is anticipated to attain 50, in the next 24 hours.

Smog is made up of a compound combination of air pollutants that are at times visible, for example a brownish-yellow haze over cities.