Systematic GHG monitoring started at Sinhagad (SNG) in 2009. SNG is located 200 km east of the Arabian Sea (73.75 E, 18.35 N, 1600 m asl) over the Western Ghats mountains (Fig.1). Routine air sampling at SNG, collected from a 10-meter meteorological tower at weekly intervals, has been operational since November 2009. This site is free from major emission sources and has prevailing light winds from the south and southeast during afternoon hours. The mean wind speed at the sampling time is typically about 0.5 to 1 m s-1, so the samples are free from local influences. The ambient temperature ranges from 25 to 30 dc. The Sinhagad site was inducted with continuous monitoring using an in-situ CRDS Picarro instrument in 2022

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