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Figure 21 Emissions of VOCs from all sources in Australia, including natural sources
Figure 22 Sources of VOCs in Australia, 2018–19
Figure 23 The ‘Dish’ at Parkes, New South Wales, 19 December 2019 shrouded in bushfire smoke and dust
Figure 24 Measurements of 24-hourly PM2.5 concentrations in calendar format, Canberra, December 2019 and January 2020
A colour-coded calendar showing that air quality on a large proportion of the days was rated ‘extremely poor’. ‘Good’ is the next most common rating.

μg/m3 = microgram per cubic metre; PM2.5 = fine particulate matter

Note: PM2.5 measurements have been coloured by the air quality categories (AQC, see Approach). An additional maroon ‘extremely poor’ category has been added to the AQC colour bar to emphasise concentrations that are more than double the National Environment Protection Measures limit for PM2.5.

Source: Health Protection Service, ACT Government

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Figure 25 Suomi National Polar-orbiting Partnership/Visible Infrared Imaging Radiometer Suite images on 20 December 2019 showing smoke cutting around the Victorian Alps towards Melbourne (left); and 4 January 2020, showing smoke travelling towards New Zealand (right)
Figure 26 (a) Comparison of PM2.5 measured indoors with outdoor PM2.5 from the nearest fixed air quality monitoring station (Civic) during the summer 2019–20 bushfire season. Both datasets are 5-minute averaged PM2.5. (b) Fraction of total particles 2.5 μm diameter or less
Line graphs showing a massive increase in PM2.5 concentration around 9 pm on 31 December 2019. The outdoor concentration went from close to zero to almost 1500 micrograms per cubic metre; the indoor rose to around 300 micrograms per cubic metre.

μg/m3 = microgram per cubic metre; µm = micrometre; PM2.5 = fine particulate matter

Note: The red arrow denotes when the indoor sensor was moved to a room with slightly better sealing ability, late in the morning of 1 January 2020.

Source: Health Protection Service, ACT Government

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Figure 27 Percentage of coverage of (a) broadleaf evergreen trees, (b) grasses and (c) shrubs in Australia
Figure 28 Radar image showing the position of the thunderstorm system at 5:00 pm, and progression of the storm eastwards in half-hourly periods
Figure 29 Example of the Melbourne grass pollen forecast at the peak of the season (mid-November 2020)
Figure 30 Example of the thunderstorm asthma forecast for 23 November 2020