Streetdirectory.com A & G Industrial Gas Trading is located at Upper Changi district in Singapore. Its commercial centre, Changi Business Park, is concentrated with large-scale industries and businesses that specialize in air freight service (Fedex Express, DHL), engineering (Boeing), supply chain logistics and technology, among others. Of great commercial prominence is Expo, a MICE hub for local and international businesses as well as a venue for trade fairs, concerts and yearly events like Motherhood fair, IT Fair and Wedding Fairs. Singapore Expo has hosted many departmental store sales e.g Robinson Sale, Metro Sale. Surrounding this industrial area, is two beautifully designed golf courses i.e Tanah Merah Golf Course and NSRCC Golf Course.