I know of a fair bit of environmental epi looking at PM2.5, it's mostly about car exhaust pollution (particularly NOx). Lots of risks, but hard to infer causation in some cases because of the complex social factors
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The challenge is that most evidence (that I know of) uses average levels of pollution. I think there's an interesting question of whether having alternating heavy/light days causes similar impacts, or potentially worse/better
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Replying to @GidMK @DrDayaSharma and
Yeah similar effect with melanoma, I learned recently, where burst exposures of sun (eg weekend warrior out on their bike) more risky than daily prolonged exposure (eg outdoor workers). We just don't have a precedent here
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Interested to read recently ref PM exposure that it takes weeks to recover from a single exposure, so what happens when it happens repeatedly. Do we recover? Is the damage worse?
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Replying to @coopesdetat @DrDayaSharma and
I’m sure
@CAR_CRE group would have some further info. Plus@christine_cowie, Geoff Morgan,@edjegasothy and others including Fay Johnston at UTAS. Some longitudinal work has started in Vic but still quite early days.1 reply 0 retweets 1 like -
Replying to @ellyhowse @coopesdetat and
This thread kinda suggests we have a gap in this area of research. Compared to tobacco control & smoking where we have 40+ yrs of evidence & data?
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Replying to @ellyhowse @coopesdetat and
Very quick graph I threw together using AQI data from https://www.dpie.nsw.gov.au/air-quality/current-air-quality … and data from Prospect in Sydney. Orange line represents the avg AQI, red is at a "very poor" rating (where there start to be impacts for general public)pic.twitter.com/aIqSK4Qvju
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Replying to @GidMK @ellyhowse and
Please note that the AQI is not the same as PM2.5. The AQI is an amalgam of all pollutants and visibility. Sometimes, but not always, it’s the ‘visibility’ reading that drives the hugely high AQI values. From a health perspective it’s easier to compare PM2.5 readings directly.
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Yeh I was going to make a graph of PM2.5 but had to get back to work 
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