REUTERS/Altaf HussainNEW DELHI, Nov 7 (Reuters) - Primary schools will reopen in India's capital New Delhi this week and curbs will be lifted on certain construction activities, authorities said on Monday, after pollution levels improved to the 'very poor' category from 'severe'. Residents in the capital have been waking up in recent weeks to hazy mornings with the sky a shade of grey. The air quality index in nearly all monitoring stations in the city was between 300 to 400 or in the "very poor" category on Monday, which experts say leads to respiratory illness on prolonged exposure. "Directions for work from home amended and offices functioning at full capacity from today," Delhi state environment minister Gopal Rai told reporters. Air quality could worsen later this week, however, the System of Air Quality and Weather Forecasting and Research said on its website.

---