Computer users most often work in closed window offices that do not let in fresh air leaving the indoor air stale and unhealthy in many cases. Putting in central air purification systems could be effective in rebalancing the air. However, air purifiers need fresh outdoor air to recycle indoors for effective functioning. Consequently a lot of workers who otherwise do not suffer from Seasonal Affective Disorder (SAD) or Winter Blues find themselves in the winter months when the heater is on, feeling more lethargic, depressed
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