Proposed Provincial Air Quality Objectives for Nitrogen ...
Transcript of Proposed Provincial Air Quality Objectives for Nitrogen ...
Proposed Provincial Air Quality Objectives for
Nitrogen Dioxide (NO2)
Jerome A. Robles, Ph.D., P.Eng.Air Quality Science Specialist
Clean Air/Environmental Standards BranchMinistry of Environment and Climate Change Strategy
Public Webinar26 May 2021
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Presentation Outline
• Summarise key findings from the review of Provincial Air Quality Objectives- NO2 levels: status and
trends- NOx emission trends
and projections
• Proposal for new Provincial Air Quality Objectives for NO2
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Nitrogen Dioxide (NO2)
• Part of highly reactive compounds: Nitrogen Oxides (NOx)
• Formed during combustion
• Can cause/aggravate asthma, reduce lung functions
• Produce ozone, acid rain, smog
• Non-threshold pollutant
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BackgroundBased on U.S. EPA and Canadian
National Ambient Air Quality Objective
Interim Provincial Air Quality Objective (2014)• 1-hour: 100 ppb (98th perc. of daily max
over 1-year)• Annual: 32 ppb
Based on Population Improvement Approach1% PIA (2020), 15% PIA (2025)
2020 CAAQS for NO2 (2017)• 1-hour: 60 ppb (98th perc. of daily max
over 3 years)• Annual: 17 ppb
2025 CAAQS for NO2 (2017)• 1-hour: 42 ppb (98th perc. of daily max
over 3 years)• Annual: 12 ppb
Provincial Framework for Development of Provincial AQOs
• Where CAAQS exist, use CAAQS and supporting science as starting point
• Where CAAQS do not exist, use criteria from leading Canadian/U.S. jurisdictions as starting point
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B.C.-Specific Factors for AQOs
Key ConsiderationsMore
Stringent Standard
Monitoring Capability
Vulnerable Population
Sensitive Receptors (e.g., environment)
Achievability
B.C. NO2 Levels 2019
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Vancouver –Downtown
Vancouver –Clark Dr.
New Westminster
Richmond
Achievability – Based on Trends
Prince George
Victoria Kamloops
N. Vancouver –2nd Narrows
B.C. NO2 Levels 2020
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Vancouver –Downtown
Vancouver –Clark Dr.
New Westminster
Richmond
Achievability – Based on Trends
Prince GeorgeQuesnel
Kamloops
N. Vancouver –2nd Narrows
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Fort St. John
Kamloops
Vancouver-Clark Dr
Vancouver-DowntownRichmond
Prince George
Achievability – 1 Hour Metric
2025 CAAQS
2020 CAAQSN. Vancouver-2nd Narrows
Victoria
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Fort St. John
Kamloops
Vancouver-Clark DrVancouver-Downtown
Richmond
Prince George
Achievability – Annual Metric
2025 CAAQS
2020 CAAQS
N. Vancouver-2nd Narrows
Victoria
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Weekday vs Weekend NO2 TrendsFort St John Kamloops N. Vancouver
Prince George Clark Drive Robson Square
Transport Influence Typically shows Weekday/Weekend Pattern
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Similar Weekday/Weekend
DifferentWeekday/Weekend- Transport influence
Weekday vs Weekend NO2 TrendsStatistical Test ResultWilcoxon-Mann-Whitney
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Achievability – B.C. Emission Trends
2019:204 Ktonnes
2009:210 Ktonnes
1999:318 Ktonnes
1992:259 Ktonnes
1999-2019 36%
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Transportation
Oil and Gas
Manufacturing
Electric Power
Ore and Mineral
Achievability – B.C. Emission Sources
Area Sources
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Transportation/Mobile Equipment
Manufacturing
Electric Power
Oil and Gas
Ores and Minerals
Annual Changes in B.C. Emissions
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2010-2019 Changes in NOx EmissionsIndustry
-7.9 Ktonnes
Transport +400 tonnes
Emission REDUCTION
Area +744 tonnes
Emission INCREASE
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2015-2019 Changes in NOx Emissions
Transport +14 Ktonnes
Emission REDUCTION
Area +1 Ktonnes
Emission INCREASE
Industry -8.3 Ktonnes
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Canada's Greenhouse Gas and Air Pollutant Emissions Projections 2020
NOx Projections (2005-2030)
• 2020 decline due to COVID-19
• 2020-2025 trend due to increase in oil and gas, transportation
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Achievability – Trends Emission Sources
Summary of Trends in Emission Sources
• NOx Emission show decreasing trends 1999-2009, nearly flat trends 2010-2019
• NOx Emissions are mostly from the Transportation Sector mainly Diesel Engines, Marine Emissions
• Transportation sector emissions has been decreasing 1999-2009, started increasing due to marine emissions 2010-2019
• NO2 from monitored sites follows transportation source patterns
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Achievability – Trends Emission Sources
Additional Information
• Multi-Sector Air Pollutants Regulation• Affects engines used in Oil and Gas, and other industry• Effective 2016, first phase 2021, stringent phase 2026
• ECCC Projection (2020 Reference Case)• Significant Reductions in NOx from Oil and Gas, other
industries (boilers, heaters and engines), Transportation
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Intentions Paper Proposals
• Based on B.C. specific factors and framework• Propose to replace interim AQO with AQO based
on 2020 CAAQS
• Clarifications on the applications of AQO• Air Quality Management• Airshed management planning• Permits/authorizations• Dispersion Models
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Permits and Authorizations
ENV regulatory staff provides guidance on technical assessments including expectations on:
• ambient air quality objectives, including provincial AQOs and CAAQS,
• ambient monitoring requirements, • emission control technology requirements, and • recommended approach to dispersion modelling,
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Dispersion Models
• Proposed AQO changes the 1-hour metric from a one-year average to three-year average
• The new 1-hour metric is now consistent with CAAQS
• ENV is developing new air quality dispersion modelling guidelines to improve accuracy of the 1-hour metric. The 1-hour metric is consistent on the proposed AQO and CAAQS
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Next Steps
• Gathering of comments and feedback:• by June 18, 2021• [email protected]
• Finalize the Policy for AQO Adoption (July 2021)• Decision and Implementation (Fall-Winter 2021)
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