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About 25 percent of Americans hardly ever venture outside, unaware or unconcerned about breathing only stale indoor air, a report says.

In an age when nearly everything can be found (and delivered) online — including food, entertainment and relationships — it’s hardly surprising to discover an “indoor generation.”

According to the federal Bureau of Labor Statistics, a nine-hour workday is the average for American wage-earners. When they return home on a typical day, 85 percent of women and 67 percent of men spend time doing work around the house.

Leisure time has become synonymous with television viewing, according to the federal data. Many Americans spend nearly three hours a day in front of the tube, and teenagers spend more than half of their leisure time with screens.

… Researchers surveyed 16,000 people from 14 countries in Europe and North America about their knowledge and perceptions of indoor/outdoor air quality and the amount of time they spend inside.

For Americans, one-quarter said they spend 21 to 24 hours inside daily, 20 percent said they spend 19 to 20 hours inside and 21 percent say they spend 15 to 18 hours inside.

Thirty-four percent said they spend zero to 14 hours inside.

Other countries with similar results to the U.S. were Britain and Canada, with 23 percent and 26 percent of their respondents respectively saying they spend 21 to 24 hours indoors.

Countries with the highest percentage of people who spend the least amount of time inside were Italy (57 percent), the Czech Republic (57 percent) and the Netherlands (51 percent). This group said they spend zero to 14 hours indoors.