Gurugram, Dec. 2 -- The district's air quality retained its "poor" category reading for the third day after a brief improvement caused by a change in weather conditions. The district's Air Quality Index rose from 245 on Sunday to 275 at 4pm on Monday, according to the Central Pollution Control Board. On Saturday, the AQI stood at 262. Teri Gram remained the worst affected monitoring station with an AQI of 306, driven primarily by high PM2.5 concentrations. Other stations in Sector 51 (299), NISE Gwal Pahari (280) and Vikas Sadan (230) also recorded "poor" air. On Sunday, IMD officials described the temporary improvement to "favourable weather conditions", with AQI staying "moderate" in Sector 51 (195) and "poor" in Vikas Sadan (241), NISE Gwal Pahari (270) and Teri Gram (295). IMD officials said wind speeds, which briefly reached 19 kmph in NCR around 2.30 pm on Sunday, dropped again on Monday. The maximum wind speed recorded was 3.6 kmph in the afternoon, blowing northwest. "The weather spell will continue to remain dry throughout the week with no warnings in place in Southern Haryana, including Gurugram. Even though temperatures are expected to drop further, other critical weather indicators for pollutant dispersal, such as mixing height and ventilation index values, are expected to remain low over the next few days," a senior IMD official said, requesting anonymity. Residents said dust and silica from construction sites were worsening air quality. Rajeev (single name) said construction activity continues unchecked near Lotus Valley School in Sector 50 despite Graded Response Action Plan (Grap) stage II restrictions. Weather forecasts indicate low northwesterly winds throughout the week. On Monday, the city logged a maximum temperature of 25.3degC and a minimum of 7.6degC, with relative humidity at 51% at 8.30am....