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Hagrid
The right answer for the question that is being asked and shown above is that: "Since the days of Ancient Rome." Outdoor air pollution first became a significant problem not only during the revolution but rather even the first days of the ancient Rome.
During the industrial revolution is when outdoor air pollution first became a significant problem.

The industrial revolution was termed as the new manufacture processes during the periods of 1820 and 1840. Textiles were the most dominant industry for the industrial revolution in terms of employment. 
The industrial revolution began in the time of Great Britain. Many of those technological innovations were of British origin. Major results of the industrial revolution were the way of standard of living where general population began to increase.