Mon Valley Sees Two More Air Quality Exceedances Wednesday

It probably won’t come as a surprise to our friends in the Mon Valley who suffered through what was at one point the worst air quality in the nation yesterday: Allegheny County experienced more air quality exceedances Wednesday – this time because of high levels of hydrogen sulfide and fine particulate matter (PM2.5).

For the third straight day Wednesday, preliminary data show concentrations of hydrogen sulfide (H2S) at Allegheny County Health Department’s Liberty air quality monitor exceeded the state’s 24-hour standard with an average concentration of 0.008 ppm. The Pennsylvania limit is 0.005 ppm.

That makes seven H2S exceedances so far in Allegheny County – four at the Liberty monitor and three more at North Braddock.

But that’s not all: For the first time this year concentrations of PM2.5 exceeded the federal health-based standard for ambient air. Preliminary data show the 24-hour average PM2.5 concentration at the Liberty monitor Wednesday was 44.6 ug/m3. The standard is 35 ug/m3.

Despite the exceedance of this health-based standard – and a health department air dispersion report Tuesday that predicted a moderate to strong surface inversion Wednesday – the public received no heads up from Allegheny County, which regularly communicates to residents various hazards through its Alerts system.

“This exceedance underscores the need for strong episodic weather regulations and better communications by the ACHD to let residents know when air is unhealthy,” GASP Executive Director Rachel Filippini said.

For those who might not be following the issue: ACHD has for the last year been crafting regulations that would help curtail industry emissions when short-term weather events are expected to exacerbate poor air quality. It’s something GASP has advocated for not only in the past year, but over the past several decades.

“We’ll say it as many times as we need to in order to get these regs passed: ACHD badly needs an emission-reduction plan in place that could be implemented within 24 hours of notice that a public health hazard exists,” she said.

Then last month, the Air Advisory Committee voted to table the regulations, sending the draft back to the regulation subcommittee for more specifics.

Filippini, who serves on the committee, stressed that while there was merit in having one more discussion to hash out details, what isn’t acceptable is letting the regulations languish in meeting after meeting.

For inquiring minds who want to know: The next regulation subcommittee is scheduled to meet on March 23 – we’ll share the agenda and details on how to join the meeting as soon as that information is available.

“In the meantime, there’s nothing preventing ACHD from warning folks when air quality will be in the orange and red through their social media channels and the Alert system,” Filippini said.
To sign up for Allegheny Alerts visit: https://member.everbridge.net/453003085611110/login
Bookmark this page to access ACHD’s the online portal to make an air quality complaint.