How do you estimate market size for industrial compressors in emerging markets?

Southeast Asia is tough for this — official stats are patchy at best. What's worked for me is triangulating from import/export trade data (UN Comtrade is free and surprisingly useful for HS code 8414), then cross-checking against industry associations like ASEAN Compressor Institute or local manufacturing federation reports. You can also back into it by tracking construction/manufacturing output growth and applying compressor intensity ratios from more mature markets like South Korea or Taiwan.