Great. Thank you.
Perhaps I'll close, because I'm sure my time is drawing short. You mentioned I think one of the great stories in the last few years, which has been the improvement in air quality in the country. Obviously the measurement components you spoke to today play a role in monitoring that.
Perhaps I'll give you the rest of my time just to elaborate on this trend in air quality improvement in the country. Perhaps you could speak to some of the bigger contributors that you found to this trend.