Gurugram, Oct. 17 -- To gauge the impact Diwali celebration has on level of pollution-air and noise-in the city, the CPCB has directed the HSPCB to monitor ambient air quality seven days before and after Diwali and check for presence of metals and particulate matter. According to the letter, the HSPCB would also monitor noise pollution on October 21 and on October 27 (the day of Diwali) to measure the impact of firecrackers in the city. A similar order was also issued last year....