AQSQID: 230050029

Site Name: Portland - Deering Oaks

Location: Portland, ME

Reporting: True, Located: True

Current AQI: 35.0

Portland ME, US: 43.660248, -70.268967

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
March 23, 2019, 5 p.m. 2.4 ppb (2) 0.6 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 47.0 ppb (36) N/A N/A 2.0 μg/m3 (8) 36.0
 
March 23, 2019, 4 p.m. 2.1 ppb (2) 0.5 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 45.0 ppb (35) N/A N/A 3.0 μg/m3 (12) 35.0
 
March 23, 2019, 3 p.m. 2.4 ppb (2) 0.6 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 44.0 ppb (34) N/A N/A 7.0 μg/m3 (29) 34.0
 
March 23, 2019, 2 p.m. 2.5 ppb (2) 0.7 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 42.0 ppb (32) N/A N/A 7.0 μg/m3 (29) 32.0
 
March 23, 2019, 1 p.m. 2.5 ppb (2) 0.5 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 40.0 ppb (31) N/A N/A 5.0 μg/m3 (21) 31.0
 
March 23, 2019, noon 2.6 ppb (2) 0.5 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 38.0 ppb (29) N/A N/A 6.0 μg/m3 (25) 29.0
 
March 23, 2019, 11 a.m. 3.0 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 43.0 ppb (33) N/A N/A 7.0 μg/m3 (29) 33.0
 
March 23, 2019, 10 a.m. 3.3 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 43.0 ppb (33) N/A N/A 7.0 μg/m3 (29) 33.0
 
March 23, 2019, 9 a.m. 3.1 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 43.0 ppb (33) N/A N/A 8.0 μg/m3 (33) 33.0
 
March 23, 2019, 8 a.m. 2.8 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 41.0 ppb (32) N/A N/A 4.0 μg/m3 (17) 32.0
 
March 23, 2019, 7 a.m. 3.4 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 43.0 ppb (33) N/A N/A 3.0 μg/m3 (12) 33.0
 
March 23, 2019, 6 a.m. 2.2 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 43.0 ppb (33) N/A N/A 6.0 μg/m3 (25) 33.0
 
March 23, 2019, 5 a.m. 2.3 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 43.0 ppb (33) N/A N/A 4.0 μg/m3 (17) 33.0
 
March 23, 2019, 4 a.m. 2.3 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 41.0 ppb (32) N/A N/A 4.0 μg/m3 (17) 32.0
 
March 23, 2019, 3 a.m. 3.9 ppb (4) 0.0 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 36.0 ppb (28) N/A N/A 5.0 μg/m3 (21) 28.0
 
March 23, 2019, 2 a.m. 4.6 ppb (4) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 36.0 ppb (28) N/A N/A 5.0 μg/m3 (21) 28.0
 
March 23, 2019, 1 a.m. 3.8 ppb (4) 0.0 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 39.0 ppb (30) N/A N/A 4.0 μg/m3 (17) 30.0
 
March 23, 2019, midnight 2.7 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 42.0 ppb (32) N/A N/A 6.0 μg/m3 (25) 32.0
 
March 22, 2019, 11 p.m. 2.7 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 43.0 ppb (33) N/A N/A 7.0 μg/m3 (29) 33.0
 
March 22, 2019, 10 p.m. 3.2 ppb (3) 0.3 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 43.0 ppb (33) N/A N/A 4.0 μg/m3 (17) 33.0
 
March 22, 2019, 9 p.m. 5.4 ppb (5) 0.6 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 41.0 ppb (32) N/A N/A 3.0 μg/m3 (12) 32.0
 
March 22, 2019, 8 p.m. 5.2 ppb (5) 0.8 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 40.0 ppb (31) N/A N/A 5.0 μg/m3 (21) 31.0
 
March 22, 2019, 7 p.m. 5.6 ppb (5) 1.5 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 39.0 ppb (30) N/A N/A 6.0 μg/m3 (25) 30.0
 
March 22, 2019, 6 p.m. 7.3 ppb (7) 3.0 ppb (3) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 40.0 ppb (31) N/A N/A 2.0 μg/m3 (8) 31.0
 
March 22, 2019, 5 p.m. 7.9 ppb (7) 3.2 ppb (3) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 40.0 ppb (31) N/A N/A 2.0 μg/m3 (8) 31.0
 
March 22, 2019, 4 p.m. 7.2 ppb (7) 3.2 ppb (3) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 41.0 ppb (32) N/A N/A 3.0 μg/m3 (12) 32.0
 
March 22, 2019, 3 p.m. 7.2 ppb (7) 3.0 ppb (3) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 41.0 ppb (32) N/A N/A 3.0 μg/m3 (12) 32.0
 
March 22, 2019, 2 p.m. 7.5 ppb (7) 2.5 ppb (2) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 42.0 ppb (32) N/A N/A 6.0 μg/m3 (25) 32.0
 
March 22, 2019, 1 p.m. 4.7 ppb (4) 2.0 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 43.0 ppb (33) N/A N/A 7.0 μg/m3 (29) 33.0
 
March 22, 2019, noon 6.6 ppb (6) 3.1 ppb (3) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 42.0 ppb (32) N/A N/A 8.0 μg/m3 (33) 33.0
 
March 22, 2019, 11 a.m. 11.0 ppb (10) 4.7 ppb (4) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 40.0 ppb (31) N/A N/A 7.0 μg/m3 (29) 31.0
 
March 22, 2019, 10 a.m. 5.9 ppb (5) 1.4 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 43.0 ppb (33) N/A N/A 7.0 μg/m3 (29) 33.0
 
March 22, 2019, 9 a.m. 2.9 ppb (3) 0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 45.0 ppb (35) N/A N/A 10.0 μg/m3 (42) 42.0
 
March 22, 2019, 8 a.m. 2.7 ppb (3) 0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 45.0 ppb (35) N/A N/A 13.0 μg/m3 (52) 52.0
 
March 22, 2019, 7 a.m. 2.2 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 48.0 ppb (37) N/A N/A 7.0 μg/m3 (29) 37.0
 
March 22, 2019, 6 a.m. 1.9 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 47.0 ppb (36) N/A N/A 6.0 μg/m3 (25) 36.0
 
March 22, 2019, 5 a.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 47.0 ppb (36) N/A N/A 8.0 μg/m3 (33) 36.0
 
March 22, 2019, 4 a.m. 2.4 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 46.0 ppb (35) N/A N/A 10.0 μg/m3 (42) 42.0
 
March 22, 2019, 3 a.m. 3.5 ppb (3) 0.2 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 45.0 ppb (35) N/A N/A 8.0 μg/m3 (33) 35.0
 
March 22, 2019, 2 a.m. 4.6 ppb (4) 0.3 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 44.0 ppb (34) N/A N/A 5.0 μg/m3 (21) 34.0
 
March 22, 2019, 1 a.m. 6.3 ppb (6) 0.8 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 44.0 ppb (34) N/A N/A 8.0 μg/m3 (33) 34.0
 
March 22, 2019, midnight 4.9 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 45.0 ppb (35) N/A N/A 9.0 μg/m3 (38) 38.0
 
March 21, 2019, 11 p.m. 4.9 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 48.0 ppb (37) N/A N/A 8.0 μg/m3 (33) 37.0
 
March 21, 2019, 10 p.m. 8.3 ppb (8) 2.1 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 48.0 ppb (37) N/A N/A 11.0 μg/m3 (46) 46.0
 
March 21, 2019, 9 p.m. 5.5 ppb (5) 1.8 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 51.0 ppb (39) N/A N/A 11.0 μg/m3 (46) 46.0
 
March 21, 2019, 8 p.m. 5.2 ppb (5) 1.5 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 52.0 ppb (40) N/A N/A 12.0 μg/m3 (50) 50.0
 
March 21, 2019, 7 p.m. 4.1 ppb (4) 2.7 ppb (3) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 51.0 ppb (39) N/A N/A 9.0 μg/m3 (38) 39.0
 
March 21, 2019, 6 p.m. 3.0 ppb (3) 1.5 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 51.0 ppb (39) N/A N/A 8.0 μg/m3 (33) 39.0
 
March 21, 2019, 5 p.m. 4.2 ppb (4) 1.6 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 52.0 ppb (40) N/A N/A 10.0 μg/m3 (42) 42.0
 
March 21, 2019, 4 p.m. 3.8 ppb (4) 1.1 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 52.0 ppb (40) N/A N/A 11.0 μg/m3 (46) 46.0
 
March 21, 2019, 3 p.m. 4.4 ppb (4) 1.3 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 50.0 ppb (38) N/A N/A 10.0 μg/m3 (42) 42.0
 
March 21, 2019, 2 p.m. 5.8 ppb (5) 1.5 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) N/A N/A N/A 9.0 μg/m3 (38) 38.0
 
March 21, 2019, 1 p.m. 9.3 ppb (9) 2.6 ppb (2) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 44.0 ppb (34) N/A N/A 9.0 μg/m3 (38) 38.0
 
March 21, 2019, noon 15.6 ppb (14) 3.0 ppb (3) N/A 13.0 ppb (12) N/A 0.0 ppb (0) 37.0 ppb (28) N/A N/A 10.0 μg/m3 (42) 42.0
 
March 21, 2019, 11 a.m. 25.3 ppb (23) 3.0 ppb (3) N/A 22.0 ppb (20) N/A 0.0 ppb (0) 25.0 ppb (19) N/A N/A 16.0 μg/m3 (59) 59.0
 
March 21, 2019, 10 a.m. 18.9 ppb (18) 0.9 ppb (1) N/A 18.0 ppb (17) N/A 0.0 ppb (0) 30.0 ppb (23) N/A N/A 12.0 μg/m3 (50) 50.0
 
March 21, 2019, 9 a.m. 18.6 ppb (17) 0.1 ppb (0) N/A 19.0 ppb (18) N/A 0.0 ppb (0) 29.0 ppb (22) N/A N/A 10.0 μg/m3 (42) 42.0
 
March 21, 2019, 8 a.m. 32.1 ppb (30) 0.5 ppb (0) N/A 32.0 ppb (30) N/A 0.0 ppb (0) 13.0 ppb (10) N/A N/A 12.0 μg/m3 (50) 50.0
 
March 21, 2019, 7 a.m. 34.7 ppb (32) 1.4 ppb (1) N/A 33.0 ppb (31) N/A 0.0 ppb (0) 10.0 ppb (8) N/A N/A 13.0 μg/m3 (52) 52.0
 
March 21, 2019, 6 a.m. 25.1 ppb (23) 0.5 ppb (0) N/A 25.0 ppb (23) N/A 0.0 ppb (0) 17.0 ppb (13) N/A N/A 22.0 μg/m3 (71) 71.0
 
March 21, 2019, 5 a.m. 18.9 ppb (18) 0.0 ppb (0) N/A 19.0 ppb (18) N/A 0.0 ppb (0) 26.0 ppb (20) N/A N/A 15.0 μg/m3 (56) 56.0
 
March 21, 2019, 4 a.m. 17.9 ppb (17) 0.0 ppb (0) N/A 18.0 ppb (17) N/A 0.0 ppb (0) 30.0 ppb (23) N/A N/A 13.0 μg/m3 (52) 52.0
 
March 21, 2019, 3 a.m. 12.8 ppb (12) 0.1 ppb (0) N/A 13.0 ppb (12) N/A 0.0 ppb (0) 39.0 ppb (30) N/A N/A 16.0 μg/m3 (59) 59.0
 
March 21, 2019, 2 a.m. 7.1 ppb (7) 0.3 ppb (0) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 47.0 ppb (36) N/A N/A 10.0 μg/m3 (42) 42.0
 
March 21, 2019, 1 a.m. 5.7 ppb (5) 0.6 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 49.0 ppb (38) N/A N/A 15.0 μg/m3 (56) 56.0
 
March 21, 2019, midnight 7.5 ppb (7) 0.9 ppb (1) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 47.0 ppb (36) N/A N/A 9.0 μg/m3 (38) 38.0
 
March 20, 2019, 11 p.m. 8.4 ppb (8) 1.1 ppb (1) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 44.0 ppb (34) N/A N/A 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 10 p.m. 7.0 ppb (6) 1.3 ppb (1) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 45.0 ppb (35) N/A N/A 9.0 μg/m3 (38) 38.0
 
March 20, 2019, 9 p.m. 6.0 ppb (6) 1.3 ppb (1) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 48.0 ppb (37) N/A N/A 11.0 μg/m3 (46) 46.0
 
March 20, 2019, 8 p.m. 4.5 ppb (4) 1.2 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 49.0 ppb (38) N/A N/A 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 7 p.m. 4.0 ppb (4) 1.4 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 49.0 ppb (38) N/A N/A 11.0 μg/m3 (46) 46.0
 
March 20, 2019, 6 p.m. 5.3 ppb (5) 1.5 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 50.0 ppb (38) N/A N/A 6.0 μg/m3 (25) 38.0
 
March 20, 2019, 5 p.m. 4.0 ppb (4) 1.2 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 50.0 ppb (38) N/A N/A 8.0 μg/m3 (33) 38.0
 
March 20, 2019, 4 p.m. 3.7 ppb (3) 1.1 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 49.0 ppb (38) N/A N/A 7.0 μg/m3 (29) 38.0
 
March 20, 2019, 3 p.m. 5.0 ppb (5) 1.7 ppb (2) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 47.0 ppb (36) N/A N/A 8.0 μg/m3 (33) 36.0
 
March 20, 2019, 2 p.m. 7.9 ppb (7) 3.0 ppb (3) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 44.0 ppb (34) N/A N/A 7.0 μg/m3 (29) 34.0
 
March 20, 2019, 1 p.m. 34.4 ppb (32) 13.2 ppb (12) N/A 21.0 ppb (19) N/A 1.0 ppb (1) 25.0 ppb (19) N/A N/A 9.0 μg/m3 (38) 38.0
 
March 20, 2019, noon 59.6 ppb (56) 29.0 ppb (27) N/A 31.0 ppb (29) N/A 1.0 ppb (1) 11.0 ppb (8) N/A N/A 16.0 μg/m3 (59) 59.0
 
March 20, 2019, 11 a.m. 69.8 ppb (67) 35.0 ppb (32) N/A 35.0 ppb (32) N/A 1.0 ppb (1) 4.0 ppb (3) N/A N/A 16.0 μg/m3 (59) 67.0
 
March 20, 2019, 10 a.m. 50.0 ppb (46) 14.0 ppb (13) N/A 36.0 ppb (33) N/A 0.0 ppb (0) 3.0 ppb (2) N/A N/A 17.0 μg/m3 (61) 61.0
 
March 20, 2019, 9 a.m. 38.5 ppb (36) 7.2 ppb (7) N/A 31.0 ppb (29) N/A 0.0 ppb (0) 6.0 ppb (5) N/A N/A 11.0 μg/m3 (46) 46.0
 
March 20, 2019, 8 a.m. 39.0 ppb (36) 6.2 ppb (6) N/A 33.0 ppb (31) N/A 0.0 ppb (0) 3.0 ppb (2) N/A N/A 10.0 μg/m3 (42) 42.0
 
March 20, 2019, 7 a.m. 51.4 ppb (48) 15.2 ppb (14) N/A 36.0 ppb (33) N/A 0.0 ppb (0) 2.0 ppb (2) N/A N/A 16.0 μg/m3 (59) 59.0
 
March 20, 2019, 6 a.m. 57.1 ppb (53) 19.5 ppb (18) N/A 38.0 ppb (35) N/A 0.0 ppb (0) 1.0 ppb (1) N/A N/A 12.0 μg/m3 (50) 53.0
 
March 20, 2019, 5 a.m. 72.8 ppb (70) 32.9 ppb (30) N/A 40.0 ppb (37) N/A 1.0 ppb (1) 1.0 ppb (1) N/A N/A 17.0 μg/m3 (61) 70.0
 
March 20, 2019, 4 a.m. 46.6 ppb (43) 7.4 ppb (7) N/A 39.0 ppb (36) N/A 0.0 ppb (0) 4.0 ppb (3) N/A N/A 15.0 μg/m3 (56) 56.0
 
March 20, 2019, 3 a.m. 27.9 ppb (26) 1.0 ppb (1) N/A 27.0 ppb (25) N/A 0.0 ppb (0) 16.0 ppb (12) N/A N/A 12.0 μg/m3 (50) 50.0
 
March 20, 2019, 2 a.m. 20.6 ppb (19) 0.3 ppb (0) N/A 20.0 ppb (19) N/A 0.0 ppb (0) 23.0 ppb (18) N/A N/A 8.0 μg/m3 (33) 33.0
 
March 20, 2019, 1 a.m. 8.8 ppb (8) 0.0 ppb (0) N/A 9.0 ppb (8) N/A 0.0 ppb (0) 38.0 ppb (29) N/A N/A 14.0 μg/m3 (54) 54.0
 
March 20, 2019, midnight 6.7 ppb (6) 0.1 ppb (0) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 44.0 ppb (34) N/A N/A 11.0 μg/m3 (46) 46.0
 
March 19, 2019, 11 p.m. 17.5 ppb (16) 0.2 ppb (0) N/A 17.0 ppb (16) N/A 0.0 ppb (0) 31.0 ppb (24) N/A N/A 11.0 μg/m3 (46) 46.0
 
March 19, 2019, 10 p.m. 9.0 ppb (8) 1.9 ppb (2) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 44.0 ppb (34) N/A N/A 8.0 μg/m3 (33) 34.0
 
March 19, 2019, 9 p.m. 8.2 ppb (8) 2.9 ppb (3) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 47.0 ppb (36) N/A N/A 10.0 μg/m3 (42) 42.0
 
March 19, 2019, 8 p.m. 6.2 ppb (6) 2.3 ppb (2) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 48.0 ppb (37) N/A N/A 5.0 μg/m3 (21) 37.0
 
March 19, 2019, 7 p.m. 4.8 ppb (4) 1.3 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 49.0 ppb (38) N/A N/A 2.0 μg/m3 (8) 38.0
 
March 19, 2019, 6 p.m. 4.3 ppb (4) 1.5 ppb (1) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 48.0 ppb (37) N/A N/A 4.0 μg/m3 (17) 37.0
 
March 19, 2019, 5 p.m. 10.2 ppb (9) 3.8 ppb (4) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 43.0 ppb (33) N/A N/A 8.0 μg/m3 (33) 33.0
 
March 19, 2019, 4 p.m. 9.8 ppb (9) 3.6 ppb (3) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 43.0 ppb (33) N/A N/A 8.0 μg/m3 (33) 33.0
 
March 19, 2019, 3 p.m. 10.8 ppb (10) 3.7 ppb (3) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 41.0 ppb (32) N/A N/A 6.0 μg/m3 (25) 32.0
 
March 19, 2019, 2 p.m. 11.4 ppb (11) 4.0 ppb (4) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 40.0 ppb (31) N/A N/A 5.0 μg/m3 (21) 31.0
 
March 19, 2019, 1 p.m. 15.5 ppb (14) 4.8 ppb (4) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 37.0 ppb (28) N/A N/A 8.0 μg/m3 (33) 33.0
 
March 19, 2019, noon 28.4 ppb (26) 8.4 ppb (8) N/A 20.0 ppb (19) N/A 0.0 ppb (0) 26.0 ppb (20) N/A N/A 14.0 μg/m3 (54) 54.0
 
March 19, 2019, 11 a.m. 40.3 ppb (37) 9.5 ppb (9) N/A 31.0 ppb (29) N/A 0.0 ppb (0) 13.0 ppb (10) N/A N/A 14.0 μg/m3 (54) 54.0
 
March 19, 2019, 10 a.m. 40.3 ppb (37) 9.6 ppb (9) N/A 31.0 ppb (29) N/A 0.0 ppb (0) 9.0 ppb (7) N/A N/A 12.0 μg/m3 (50) 50.0
 
March 19, 2019, 9 a.m. 33.1 ppb (31) 2.9 ppb (3) N/A 30.0 ppb (28) N/A 0.0 ppb (0) 10.0 ppb (8) N/A N/A 10.0 μg/m3 (42) 42.0
 
March 19, 2019, 8 a.m. 42.3 ppb (39) 7.0 ppb (6) N/A 35.0 ppb (32) N/A 0.0 ppb (0) 3.0 ppb (2) N/A N/A 10.0 μg/m3 (42) 42.0
 
March 19, 2019, 7 a.m. 29.6 ppb (27) 1.7 ppb (2) N/A 28.0 ppb (26) N/A 0.0 ppb (0) 9.0 ppb (7) N/A N/A 16.0 μg/m3 (59) 59.0
 
March 19, 2019, 6 a.m. 33.7 ppb (31) 1.8 ppb (2) N/A 32.0 ppb (30) N/A 0.0 ppb (0) 6.0 ppb (5) N/A N/A 13.0 μg/m3 (52) 52.0
 
March 19, 2019, 5 a.m. 32.4 ppb (30) 1.4 ppb (1) N/A 31.0 ppb (29) N/A 0.0 ppb (0) 7.0 ppb (5) N/A N/A 13.0 μg/m3 (52) 52.0
 
March 19, 2019, 4 a.m. 51.9 ppb (48) 14.8 ppb (14) N/A 37.0 ppb (34) N/A 0.0 ppb (0) 3.0 ppb (2) N/A N/A 15.0 μg/m3 (56) 56.0
 
March 19, 2019, 3 a.m. 61.6 ppb (58) 22.0 ppb (20) N/A 40.0 ppb (37) N/A 0.0 ppb (0) 1.0 ppb (1) N/A N/A 15.0 μg/m3 (56) 58.0
 
March 19, 2019, 2 a.m. 53.9 ppb (50) 14.3 ppb (13) N/A 40.0 ppb (37) N/A 0.0 ppb (0) 1.0 ppb (1) N/A N/A 16.0 μg/m3 (59) 59.0
 
March 19, 2019, 1 a.m. 36.1 ppb (33) 8.8 ppb (8) N/A 27.0 ppb (25) N/A 0.0 ppb (0) 15.0 ppb (12) N/A N/A 10.0 μg/m3 (42) 42.0
 
March 19, 2019, midnight 19.1 ppb (18) 2.6 ppb (2) N/A 17.0 ppb (16) N/A 0.0 ppb (0) 27.0 ppb (21) N/A N/A 9.0 μg/m3 (38) 38.0
 
March 18, 2019, 11 p.m. 6.5 ppb (6) 0.0 ppb (0) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 41.0 ppb (32) N/A N/A 10.0 μg/m3 (42) 42.0
 
March 18, 2019, 10 p.m. 5.9 ppb (5) 0.3 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 44.0 ppb (34) N/A N/A 8.0 μg/m3 (33) 34.0
 
March 18, 2019, 9 p.m. 3.5 ppb (3) 0.4 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 47.0 ppb (36) N/A N/A 9.0 μg/m3 (38) 38.0
 
March 18, 2019, 8 p.m. 2.1 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 49.0 ppb (38) N/A N/A 4.0 μg/m3 (17) 38.0
 
March 18, 2019, 7 p.m. 2.0 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 48.0 ppb (37) N/A N/A 5.0 μg/m3 (21) 37.0
 
March 18, 2019, 6 p.m. 1.8 ppb (2) 0.3 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 48.0 ppb (37) N/A N/A 5.0 μg/m3 (21) 37.0
 
March 18, 2019, 5 p.m. 1.7 ppb (2) 0.4 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 47.0 ppb (36) N/A N/A 4.0 μg/m3 (17) 36.0
 
March 18, 2019, 4 p.m. 1.5 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 47.0 ppb (36) N/A N/A 2.0 μg/m3 (8) 36.0
 
March 18, 2019, 3 p.m. 2.9 ppb (3) 0.8 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 45.0 ppb (35) N/A N/A 2.0 μg/m3 (8) 35.0
 
March 18, 2019, 2 p.m. 2.8 ppb (3) 0.7 ppb (1) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 44.0 ppb (34) N/A N/A 5.0 μg/m3 (21) 34.0
 
March 18, 2019, 1 p.m. 5.3 ppb (5) 1.5 ppb (1) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 40.0 ppb (31) N/A N/A 5.0 μg/m3 (21) 31.0
 
March 18, 2019, noon 7.9 ppb (7) 1.8 ppb (2) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 37.0 ppb (28) N/A N/A 8.0 μg/m3 (33) 33.0
 
March 18, 2019, 11 a.m. 15.9 ppb (15) 1.7 ppb (2) N/A 14.0 ppb (13) N/A 0.0 ppb (0) 27.0 ppb (21) N/A N/A 8.0 μg/m3 (33) 33.0
 
March 18, 2019, 10 a.m. 20.2 ppb (19) 0.2 ppb (0) N/A 20.0 ppb (19) N/A 0.0 ppb (0) 21.0 ppb (16) N/A N/A 10.0 μg/m3 (42) 42.0
 
March 18, 2019, 9 a.m. 17.1 ppb (16) 0.0 ppb (0) N/A 17.0 ppb (16) N/A 0.0 ppb (0) 23.0 ppb (18) N/A N/A 10.0 μg/m3 (42) 42.0
 
March 18, 2019, 8 a.m. 10.9 ppb (10) 0.0 ppb (0) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 29.0 ppb (22) N/A N/A 6.0 μg/m3 (25) 25.0
 
March 18, 2019, 7 a.m. 11.9 ppb (11) 0.0 ppb (0) N/A 12.0 ppb (11) N/A 0.0 ppb (0) 28.0 ppb (22) N/A N/A 9.0 μg/m3 (38) 38.0
 
March 18, 2019, 6 a.m. 10.6 ppb (10) 0.0 ppb (0) N/A 11.0 ppb (10) N/A 0.0 ppb (0) 30.0 ppb (23) N/A N/A 6.0 μg/m3 (25) 25.0
 
March 18, 2019, 5 a.m. 9.2 ppb (9) 0.0 ppb (0) N/A 9.0 ppb (8) N/A 0.0 ppb (0) 32.0 ppb (25) N/A N/A 7.0 μg/m3 (29) 29.0
 
March 18, 2019, 4 a.m. 4.8 ppb (4) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 39.0 ppb (30) N/A N/A 6.0 μg/m3 (25) 30.0
 
March 18, 2019, 3 a.m. 5.8 ppb (5) 0.0 ppb (0) N/A 6.0 ppb (6) N/A 0.0 ppb (0) 38.0 ppb (29) N/A N/A 4.0 μg/m3 (17) 29.0
 
March 18, 2019, 2 a.m. 8.2 ppb (8) 0.0 ppb (0) N/A 8.0 ppb (7) N/A 0.0 ppb (0) 35.0 ppb (27) N/A N/A 7.0 μg/m3 (29) 29.0
 
March 18, 2019, 1 a.m. 6.7 ppb (6) 0.0 ppb (0) N/A 7.0 ppb (6) N/A 0.0 ppb (0) 37.0 ppb (28) N/A N/A 7.0 μg/m3 (29) 29.0
 
March 18, 2019, midnight 5.0 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 39.0 ppb (30) N/A N/A 6.0 μg/m3 (25) 30.0
 
March 17, 2019, 11 p.m. 3.7 ppb (3) 0.0 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 41.0 ppb (32) N/A N/A 6.0 μg/m3 (25) 32.0
 
March 17, 2019, 10 p.m. 2.1 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 44.0 ppb (34) N/A N/A 6.0 μg/m3 (25) 34.0
 
March 17, 2019, 9 p.m. 1.4 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 44.0 ppb (34) N/A N/A 5.0 μg/m3 (21) 34.0
 
March 17, 2019, 8 p.m. 1.2 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 45.0 ppb (35) N/A N/A 4.0 μg/m3 (17) 35.0
 
March 17, 2019, 7 p.m. 1.2 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 45.0 ppb (35) N/A N/A 4.0 μg/m3 (17) 35.0
 
March 17, 2019, 6 p.m. 1.6 ppb (1) 0.3 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 44.0 ppb (34) N/A N/A 5.0 μg/m3 (21) 34.0
 
March 17, 2019, 5 p.m. 1.7 ppb (2) 0.4 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 44.0 ppb (34) N/A N/A 6.0 μg/m3 (25) 34.0
 
March 17, 2019, 4 p.m. 1.7 ppb (2) 0.4 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 43.0 ppb (33) N/A N/A 4.0 μg/m3 (17) 33.0
 
March 17, 2019, 3 p.m. 1.3 ppb (1) 0.2 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 43.0 ppb (33) N/A N/A 4.0 μg/m3 (17) 33.0
 
March 17, 2019, 2 p.m. 1.6 ppb (1) 0.4 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 43.0 ppb (33) N/A N/A 3.0 μg/m3 (12) 33.0
 
March 17, 2019, 1 p.m. 2.1 ppb (2) 0.4 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 42.0 ppb (32) N/A N/A 2.0 μg/m3 (8) 32.0
 
March 17, 2019, noon 1.9 ppb (2) 0.3 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 43.0 ppb (33) N/A N/A 5.0 μg/m3 (21) 33.0
 
March 17, 2019, 11 a.m. 2.5 ppb (2) 0.2 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 42.0 ppb (32) N/A N/A 9.0 μg/m3 (38) 38.0
 
March 17, 2019, 10 a.m. 2.7 ppb (3) 0.1 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 41.0 ppb (32) N/A N/A 4.0 μg/m3 (17) 32.0
 
March 17, 2019, 9 a.m. 2.8 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 40.0 ppb (31) N/A N/A 4.0 μg/m3 (17) 31.0
 
March 17, 2019, 8 a.m. 2.6 ppb (2) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 41.0 ppb (32) N/A N/A 6.0 μg/m3 (25) 32.0
 
March 17, 2019, 7 a.m. 4.4 ppb (4) 0.0 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 38.0 ppb (29) N/A N/A 6.0 μg/m3 (25) 29.0
 
March 17, 2019, 6 a.m. 2.2 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 41.0 ppb (32) N/A N/A 5.0 μg/m3 (21) 32.0
 
March 17, 2019, 5 a.m. 4.9 ppb (5) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 38.0 ppb (29) N/A N/A 6.0 μg/m3 (25) 29.0
 
March 17, 2019, 4 a.m. 4.6 ppb (4) 0.0 ppb (0) N/A 5.0 ppb (5) N/A 0.0 ppb (0) 39.0 ppb (30) N/A N/A 6.0 μg/m3 (25) 30.0
 
March 17, 2019, 3 a.m. 3.6 ppb (3) 0.0 ppb (0) N/A 4.0 ppb (4) N/A 0.0 ppb (0) 40.0 ppb (31) N/A N/A 9.0 μg/m3 (38) 38.0
 
March 17, 2019, 2 a.m. 2.7 ppb (3) 0.0 ppb (0) N/A 3.0 ppb (3) N/A 0.0 ppb (0) 41.0 ppb (32) N/A N/A 5.0 μg/m3 (21) 32.0
 
March 17, 2019, 1 a.m. 1.8 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 43.0 ppb (33) N/A N/A 4.0 μg/m3 (17) 33.0
 
March 17, 2019, midnight 2.1 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 43.0 ppb (33) N/A N/A 6.0 μg/m3 (25) 33.0
 
March 16, 2019, 11 p.m. 2.2 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 44.0 ppb (34) N/A N/A 9.0 μg/m3 (38) 38.0
 
March 16, 2019, 10 p.m. 2.0 ppb (2) 0.1 ppb (0) N/A 2.0 ppb (2) N/A 0.0 ppb (0) 45.0 ppb (35) N/A N/A 8.0 μg/m3 (33) 35.0
 
March 16, 2019, 9 p.m. 1.2 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 47.0 ppb (36) N/A N/A 5.0 μg/m3 (21) 36.0
 
March 16, 2019, 8 p.m. 1.5 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 47.0 ppb (36) N/A N/A 5.0 μg/m3 (21) 36.0
 
March 16, 2019, 7 p.m. 1.7 ppb (2) 0.2 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 47.0 ppb (36) N/A N/A 6.0 μg/m3 (25) 36.0
 
March 16, 2019, 6 p.m. 1.4 ppb (1) 0.1 ppb (0) N/A 1.0 ppb (1) N/A 0.0 ppb (0) 47.0 ppb (36) N/A N/A 5.0 μg/m3 (21) 36.0