Current issues

Brooklyn air monitoring results for November and December 2014


Four days exceeded the PM10 air quality objective in Brooklyn during November and December.

Observations on the air monitoring results

The results for November and December are slightly worse than the same period last year, when there were three days that exceeded the objective. This stopped the trend of air quality improvements – relative to recent years – that had been recorded in Brooklyn since the middle of February in 2014.

Two of the four days that exceeded the PM10 air quality objective during November and December occurred during atypical conditions for poor air quality in Brooklyn. Firstly, on Saturday 8 November, PM10 levels exceeded the air quality objective in Brooklyn for only the third weekend day since monitoring began in late 2009, while another unusual episode of poor air quality was recorded on Tuesday 16 December, when a strong southwesterly wind change resulted in windblown dust impacting most of the city.

In 2014, Brooklyn experienced more dry weekdays with northerly winds than in any other year since air monitoring began in the suburb. This is significant because those are the conditions that facilitate the transport of PM10 from the Brooklyn Industrial Precinct to the neighbouring residential area to the south.

An increase in poor air quality in Brooklyn would have been expected during 2014 given the prevalence of dry weekdays with northerly winds, so it is encouraging to report that only the very wet year of 2011 had fewer poor air quality days in Brooklyn than this year. The results for 2014 would have been even better except for the four consecutive poor air quality days that occurred due to bushfire smoke in February.

Despite these signs of encouragement Brooklyn’s air quality still remains worse than anywhere else monitored by EPA in Victoria.

Statistics

Air monitoring statistics for Brooklyn Industrial Precinct November–
December 2014
2014 total
Number of days that exceeded the PM10 air quality objective 4 28
Number of days with consistent northerly winds and no recent rain 3 66
Number of hours of poor air quality 31 244
Percentage of poor air quality occurring between 7 and 11 am 42% 56%
Percentage of poor air quality occurring during northerly winds 65% 75%
Number of poor air quality alerts issued for Brooklyn 2 31

List of days that exceeded the PM10 air quality objective (September–October 2014)
8 November 2014
13 November 2014
20 November 2014
16 December 2014

Number of days that exceeded the PM10 air quality objective
November–December 2014 4 2014 total 28
November–December 2013 3 2013 total 28
November–December 2012 3 2012 total 30
November–December 2011 1 2011 total 13
November–December 2010 4 2010 total 32
November–December 2009 10 2009 total N/A (air monitoring
began late Oct 2009)
       

Number of days with consistent northerly winds and no recent rain
November–December 2014 3 2014 total 66
November–December 2013 4 2013 total 49
November–December 2012 6 2012 total 60
November–December 2011 3 2011 total 48
November–December 2010 8 2010 total 48
November–December 2009 5 2009 total N/A (air monitoring
began late Oct 2009)
       

Rainfall (mm)
November–December 2014 103.0 2014 total 373.6
November–December 2013 94.4 2013 total 485.0
November–December 2012 69.2 2012 total 465.8
November–December 2011 194.4 2011 total 767.4
November–December 2010 175.0 2010 total 613.0
November–December 2009 111.0 2009 total N/A (air monitoring
began late Oct 2009)

Page last updated on 19 May 2016