Everyone knows it comes from crop burning across SE Asia. Why do they burn? Because they don't own tractors to turn the soil over, so burning is the cheapest way. Now for the cost of 3 submarines you could buy 28,000 tractors, enough for three in every agricultural tambon. You could rent them out for a nominal fee and over time the investment would pay for itself. Immediately the nation would see an improvement in health. But of course defense of the realm must take priority over the nation's health.